/sci/ - Science & Math

>>9393467
Why do dogs have wet noses?

>>9393598
>Why do dogs have wet noses?
Moist noses are one of the ways that canines can regulate body temperature and cool down

>>9393467
Anyone care to help me out here? I'm having the most difficult time simplifying pic related. So I identify the LCD as (x+1) and multiply the terms by that to get

x-(x+1/x) / x+(x+1/x)

I can't figure out how to get from here to the next step. I used an online calculator and they simplify (x+1/x) to (1 + 1/x) but I don't understand that step. Could anyone explain this to me in brainlet terms?

>>9393705
sorry for shit handwriting

>>9393705
2+1/2=5/2 while 1+1/2=3/2 so they're clearly not the same.
>>9393713
The denominator has no real roots so I don't think you can simplify this further.

>>9393713
Thanks anon, and your handwriting is great compared to mine. So I worked the problem to this, and since they're both divided by x, I can cancel those out? Does this look correct? Btw that's supposed to be a heart, I can't draw for my life

>>9393467
How do I get over my social anxiety? It is seriously holding me back. I am in my third year of university. No friends. No work experience. No connections with any professors.

Been to 3 psychologists. Tried ssri/snri. Nothing has helped any significant amount.

>>9393467
what are limits actually used for?

>>9393771
phenibut m8

>>9393781
>Research in animals shows that it might decrease anxiety and have other effects on the body. But phenibut has not been studied in people, so no one knows whether it might work as a medicine.
I don't want to be lab rat

>>9393787
there are Russian studies but whatever mate, if you want to be miserable who am I to stop you.

>>9393787
>post on /sci/
>not ready to make personal sacrifices to the cause of advancing scientific progress
were it not for the laws of this land I'd have slaughtered you where you stand

What's the y intercept of
F (x) = x/x+2 ?

Why do rotting things get warm? Friction?

Why has my consciousness been with this human throughout its life? What attaches my particular consciousness to this particular human?

>>9393931
consciousness is a brain function

>>9393954
With respect to consciousness, how are the brain functions of my 5 year old self, 15 year old self and 25 year old self identical?

>>9393851
optimal temperature for bacteria is a lil' bit higher than human body temperature.

>>9393962
the stream never breaks across the years

>>9393772
in physics they're used to determine systems/get constants to equations
>>9393822
you are trolling or didn't read this

>>9393972
How? There have been drastic changes to my physiology, mind, and identity. What has been physically constant?

>the stream never breaks
Are there analogues to this in other phenomena?

>>9393967
How do the bacteria create an increase in temperature?

When I buy eggs at the grocery store, how come they don’t become chickens if I never eat them?

>>9393979
nobody knows how consciousness works m8
there was recently a guy who was living with 10% or something of his brain because of fluid and he still had full consciousness

I would put it on a metaphysical part at least some what but there's no way to prove what i'm saying

>>9393986
Can't someone give me a quick rundown of Dennett's explanation or something? What about the observable neuroanatomical structures that are constant across one's life and suspected of giving rise to consciousness.

>>9393467
what is the best book to learn geometry from? anyone have recommendations?

[math]f[/math] is a differentiable in its whole domain, which is all real numbers. If [math]A(0,1)∈Cf[/math], calculate the following limit:

[math]\lim_{x\to0}\frac{f(x^2)-1}{x}[/math]

Any tips on how to solve this one?
Thanks.

>>9394086
meant to say differentiable function

>>9394086
define "A(0,1) ∈ Cf"

>>9394086
literally use the definition of derivative

>>9394092
[math]A[/math] is a point, with its coordinates being [math]x=0,y=0[/math], and it's a point that belongs to the graph of [math]f[/math].

>>9394100
[math]y=1[/math]

god damnit it

>>9394099
Then I'll have:

[math]\lim_{x\to0}\frac{f(x^2)-f(0)}{x-0}[/math]

What am I missing here

well you are missing the answer, but do you see how to use the assumption that f is differentiable to evaluate this here limit ?

>>9394133
something like this >>9394109 I suppose?
I can't think of a way to make this equal to [math]f'(0)[/math]

>>9394150
[math]
\lim\limits_{x \to 0} \frac{f(x^2)-f(0)}{x-0} =
\lim\limits_{x \to 0} \frac{f(x^2)-f(0^2)}{x-0} \stackrel{\text{chain rule}}{=}
f'(0^2) (2 \cdot 0) = 0

[/math]

>>9394265
I haven't been taught about chain rule, hence I can't use it, nor use what you've posted, because, even if it's right, if there isn't in my textbook, then it won't count as correct.

The limit in the first post was the first sub-question. The second one is the following:

Prove that:
[math]\lim_{x\to 0}\frac{f^2(2x)-1}{x}=4f'(0) [/math]

Those two must be linked in some way.

>>9394303
>>9394265
Also if it helps, [math]f(x) [/math] needs to be calculated in the next sub-question and its equal to:

[math]f(x)=2-√(x^2+1), x\in\mathbb{R}[/math]

I literally struggled for hours to prove that every rational number has a decimal expansion which starts repeating at some point. And even then I had to look it up on wikipedia. Tell me honestly sci, should I kill myself?

I have to find if this converges or diverges and if it converges where it converges to.

∑(1/⌊log n⌋ - 1/⌊log (n+1)⌋. (Here ⌊x⌋ is the "round down" function, which rounds x down to the nearest smaller integer.)

But the professor didn't specify where n starts, if I try to solve it with n starting at 1 i get a 1/0, with n starting at 2 i also get a 1/0. What am I doing wrong?
I tried finding the partial sum of this since it's a telescoping series but that isn't getting me anywhere.

>>9394373
>But the professor didn't specify where n starts, if I try to solve it with n starting at 1 i get a 1/0, with n starting at 2 i also get a 1/0. What am I doing wrong?
So start at 3

>>9394373
>with n starting at 2 i also get a 1/0.
You shouldn't

>>9394378
>>9394382
the round down of log(2) and log(3) both are 0

Guys I have a Maths and English assessment coming up for a fancy job. Do you know any websites I could you to brush up on my problem solving and writing, please?

>>9394388
>the round down of log(2) and log(3) both are 0
log(3) doesn't round down to 0

>>9394393
Uhhh... yes it does?

>>9394398
Why are you using log with base 10?

>>9394402
When the base is not specified it's assumed that it's 10? Am I wrong?

>>9394412
>When the base is not specified it's assumed that it's 10? Am I wrong?
Usually base e from my experience, either way whatever base b you use just start indexing from where log_b(n)>=1

>>9393732
When was it ever said that x is in R?

In which grain size class is capillarity most EFFICIENT? Clay, Silt or Sand?

Deltas are most common along the highest coast lines?

>>9394412
log base 10 is kid's stuff. Always assume log base e in mathematical contexts.

>>9394800
>yes mom, I am an internet bad guy

Brainlet here.
Writing my bachelor thesis for math, and this is my first real "scientific" paper. When I write definitions and theorems that I got from a book, do I quote them, or just give the citation for them?

>>9394800
But in CS contexts, assume log base 2.

What is the difference between Electricity and Electromagnetism?

>>9394897
magnets, how do they work?

>>9393822
>What's the y intercept of
>F (x) = x/x+2 ?
(0,0)
0/(0+2) = 0

>>9394815
it's true you retard

>>9395043
you seriously don't use lnx when the base is e?

>>9395055
>you seriously don't use lnx when the base is e?
log is standard

>>9395057
who cares nerd. computers are discrete machines and so you will never need any of that calculus shit in computer science

>>9395055
The highest class in which I used [math] \ln [/math] to mean base e was differential equations. After that everyone uses log, and instead of e^x we use exp(x).

Results look much more clearer like that, specially if you do stuff like analytic number theory where loglogloglog is something you see every day. Imagine lnlnlnlnlnln. That looks like shit!

>>9395116
>who cares nerd. computers are discrete machines and so you will never need any of that calculus shit in computer science
Why would anyone use obscure CS notation instead of the mathematical standard?

>>9395116
>computer "science"

>>9395163
>"computer" "science"

>>9393467
amirite?

>>9395183
i don't care, i'm not even american and we don't call it that. our name for it is a combination of the words information and mathematics.
Which IMO makes it more useful for every day life than plain mathematics

>>9395187
I think that's almost too complicated.
What has to happen is that your mom fucks her own father. Then you are your mom's daughter AND sister.
Then your mom goes and gets pregnant with some other guy. You do the same with some other guy.
Then those 2 children get together and have a child.
You are that child's grandmother. Your mom is also that child's grandmother.

Right?

>>9395199
>i'm not even american and we don't call it tha
But you did call it that.

>>9395217
There's multiple solutions. damn..

>>9393467
I know the sticky says "no homework", but /wsr/ couldn't help me.
I tried using the squeeze theorem, but failed to find a lower boundary, that had max f(x) in it. Looking for a "small enough epsilon" didn't get me anywhere.

>>9395678
I think you have to assume f is non-negative valued. Then, for every epsilon there is a delta around argmax f such that f is within epsilon/2 of max f. Then, for sufficiently large n, even the step function with value zero outside the delta-neighborhood of argmax f, and max f - epsilon/2 inside that neighborhood, has this n-th root of the integral within epsilon of max f.
Or something like this.

>>9395678
Hint:
[eqn]\left(\int_a^b f\left(x \right)^n\,\mathrm dx\right)^\frac1n\,=\,M\,\left(\int_a^b \left(\frac{f\left(x\right)}M\right)^n\,\mathrm dx\right)^\frac1n[/eqn]

>>9394858
It goes "Theorem (Author, [Book]):".
>>9394897
One is the Lorentz boost of the other.
>>9394940
Domain wall defects caused by the ferromagnetic order parameter.

Hello /sci/.

What's this symbol called? Context is lines, vectors and linear algebra.

>>9396201
It's the letter L.

>>9396201
[math] \ell [/math]
ell

>>9396201
cursive L

>>9396324
>>9396326
>>9396330
Awesome, thanks.

Not really a stupid question,but whatever

What are the signs of a good computer science program? What are the signs of a bad one?

why does running my space heater cost more than my computer?
the space heater is 1500W and my computer has a 700W psu. this means it takes more energy to run the heater vs the computer right? I would think a computer takes up a lot more energy than a space heater.

Will a person with age-induced hearing loss notice when you shout at him?

The underlying question is this : is partial hearing loss a kind of "dBm filter" where anything below a certain threshold isn't heard, and anything above the threshold is heard in full. Or is it more like a noise reduction filter where any sound will be lowered by x%?

>>9396437
Also note that your computer's PSU isn't drawing 700 watts off the wall at all times. In order for it to draw 700 watts, it must be at full load (unlikely, unless you have a mutli-GPU solution, and even then, it would draw more than 700 watts to compensate for the energy lost during AC to DC conversion).

>>9396410
Good:
* Microprocessors and computer architecture courses
* Program proof courses
* No OOP first year
* No C++ before at least one year of C
* Unix-like systems (a lot better suited for programming)
* Numerical analysis

Bad:
* Proud that the course "The Beauty and Joy of Computing" is over 50% attended by females
* Emphasizes on webdev
* "Don't worry about performances/memory/bandwidth, we've got plenty of resources in CURRENT_YEAR"
* Takes in people with no proficiency in math

>>9396410
If you have more than one class on intro programming, it's shit.
If you have dedicated classes to OOP, web dev, or GUIs; it's shit.
If you're not required to take Computer Architecture, Operating System Theory, and Compilers; it's shit
If you're not required to take Calculus, Linear Algebra, Proofs, (Calculus based) Probability, (Calculus based) Statistics, Combinatorics & Graph Theory, or took watered down versions in the CS department; it's shit.
If you're not required to take Programming Paradigms, Type and Programming Language Theory, Formal Languages & Automata, Computability Theory, and Complexity Theory; it's shit.
If you're don't at least do one of Networking, Databases, or Distributed Computing; it's shit.
If you don't have a capstone project to graduate, it's shit.

>>9396471
>* No C++ before at least one year of C

Fuck off /g/

>>9394373
It converges to 1/⌊log n_0⌋ because it telescopes and -1/⌊log n_f+1⌋ -> 0

>>9396484
C++ is an incredibly complicated language. Learning it without knowing C well is so suicidal only a retarded code monkey like you would want it.

Can someone help me with this? I want to plot the 5 different graphs this function gives on MATLAB, but somehow I only get one on the plot. Thanks.

a=4.73;
b=7.85;
c=11;
d=14.14;
e=17.27;

q=[a b c d e];

syms x;

hold on;
for i=length(q)
f(x)=sinh(q(i)*x)-sin(q(i)*x) - ((sinh(q(i))-sin(q(i)))/(cosh(q(i))-cos(q(i))))*(cosh(q(i)*x)-cos(q(i)*x))^2;
end

fplot(f(x))

>>9396500
>you need to learn everything at once

pure autismo

https://www.youtube.com/watch?v=YnWhqhNdYyk

>>9396506
Guaranteed your C++ programs start with `class Program {`.

>>9396502

a=4.73;
b=7.85;
c=11;
d=14.14;
e=17.27;

q=[a b c d e];

f_i=@(i, x) sinh(q(i)*x)-sin(q(i)*x) - ((sinh(q(i))-sin(q(i)))/(cosh(q(i))-cos(q(i))))*(cosh(q(i)*x)-cos(q(i)*x))^2;

hold on;
for i=length(q)
fplot(@(x) f_i(i, x))
end
hold off;

>>9396508
???

>>9396511
thank you but I still get only one graph on the plot

>>9396511
insert "figure;" before the "hold on;"

>>9396515
Haven't done Matlab in a while, but I would be suspicious about "for i=length(q)".
Wouldn't "for i=1:length(q)" be better?

>>9396520
still get only one graph...

>>9396502
Probably because some of them get very big very quickly and Matlab isn't doing a good job of figuring out what plot range to use so that they're all visible.

>>9396523
still I should be able to see them

>>9393467
Is 0.999... its own universe, expanding itself to the untangible border 1?

>>9396532
0.999... is just a different notation for [math] \lim\limits_{n \to \infty} \sum\limits_{i=1}^{n} \frac{9}{10^i} [/math]
This thing makes sense if and only if the limit actually exists. The limit actually exists and it is 1.
0.999... is not its own thing. It's denoting the limit of that series/sequence.

>>9396523
nothing?

>>9396650
Try not using the symbolic package.

>>9396661
still, same thing

How would one draw a Quaternary deposits’ profile from A-B here? I have no idea how to do these. Aside from starting from bedrock and working up, I still cant wrap my head around it.

>>9396703
You're retarded and doing something wrong.

How would one go about deriving a survival function from a data set? OLS?

I'm interested in programming language theory and compilers design. Where should i start? I have 0 background in theoretical cs, but i have some background in programming.

is there a more intuitive way to understand the relationship between the derivative and the integral?

the way I know right now is that you have some unknown function A(x) that represents the area under f(x) between some fixed point and the point x.

then you say that shifting x by dx creates a new sliver of area, equal to f(x) times dx as dx approaches zero. then you say that this new amount of area is described in A(x) as A(x+dx)-A(x).

Then from here you rearrange this result and get that f(x)=(A(x+dx)-A(x))/dx. And from what we know about derivatives, the limit of that as dx approaches zero is going to be A'(x). So we can find A(x) by taking the antiderivative of f(x).

This is how it makes sense to me, but I'm left thinking there has to be some more intuitive way to understand this. Some relationship between what it means for f(x) to be the derivative of, and therefore a function representing the slope of the function describing the area under the graph. Are there any 'better' explanations of this relationship for a beginning calculus student, or is this kind of an understanding good for now?

>>9397474
>i have some background in programming
Elaborate?

>>9397500
i know some c++ and qt? idk, i think my code will tell you much more about me: https://github.com/7Y2RPXK3ETDCNRDD/Koondelick

>>9397474
All you need:
* finite automata/regular expressions/regular languages, with all the classical algorithms and tools (pump lemma, determinizing and simplifying automata);
* grammars (linear and context-free);
* LR automata;
* have fun with Lex and YACC.

>>9397481
You'll hardly understand it before you prove the fundamental theorem of calculus (which isn't too hard if you're very familiar with [math]\left(\varepsilon,\, \delta\right)[/math] proofs). Until then, I'd advise you to think of it in terms of speed and position (or energy and power) instead or to try to understand the relationship with the rectangle approximation (which is valid in exactly the same context where the fundamental theorem of calculus applies).

>>9397513
from what i understand, everything you've listed (except for lex and yacc) is related to automata theory and formal language theory, and both are part of complexity theory. so basically i need to find a book on complexity theory, correct?

>>9397569
>both are part of complexity theory
They're not. Both are part of language theory. But I bet all books on compiler design cover both, so you should look for that.

>>9397576
thanks

>>9397569
lex and yacc are also related to automata theory and formal language theory. lex generates a finite automaton from a regular grammar, yacc generates a pushdown automaton from a context-free grammar.

>>9397474

http://4chan-science.wikia.com/wiki/Computer_Science_and_Engineering#Computer_Organization_and_Architecture
http://4chan-science.wikia.com/wiki/Computer_Science_and_Engineering#Various_Programming_Languages.2C_Paradigms.2C_and_Compilers
http://4chan-science.wikia.com/wiki/Computer_Science_and_Engineering#Type_Theory_and_Programming_Language_Theory

>>9396437
It seems like it, but the computer definitely runs on fewer watts. My 400W PSU PC + 23-inch monitor only consumes ~75W when I'm just passively browsing the internet.

The reason why space heaters use such retarded amounts of energy is because when you use one, you want the room to heat up really fucking fast, and 1500W is what will do that for you

>>9393983
I think they only sell non-fertilized eggs, my friend. That's why they won't hatch even if you sit on 'em for a few weeks.

Source: Used to raise chickens

>>9393467
With genetic engineering on the rise, I must ask a few scary questions...

Will furries be able to modify themselves into actual abominations?
Will we ever make a real cat girl (anime kind)?

this is probably a really stupid question, but whatever.

how do directions work in space? on earth, north, west, east, and south are just relative to this planet. what happens beyond our planet?

>>9398096
You have to define your "directions" with respect to something else. you could use the Sun as a center and use spherical coordinates (which, using the obvious coordinate setup, would mean every point is defined by a distance from the sun, an angle with respect to the axis perpendicular to the solar system disc, and another angle rotating around that axis).

If you're asking what a galactic civilization would use in place of NSEW, the answer is probably "nothing." The only reason NSEW is useful is because we live on a sphere, and because it's possible to make short trips like "go 5 km north to the grocery store". In space, there's no thing as a short trip, and since everything is really far apart, it's easier to give everything in your neighborhood a name, so you'd say "go to planet X." On Earth, there's shit everywhere, so remembering a billion names for everything in a square kilometer is inconvenient

>>9393981
Catabolic activity. Living things generally convert sugars to ATP or reducing agents for other cellular activities. This conversion process is not completely efficent and energy is lost to its surroundings by increasing the average kinetic activity, a measurement of temperature. Its like a car engine that burns fuel to convert to mechanical energy. The engine gets hot because its not completely efficient at the conversion process.

>>9398087
I’m being serious about the possibility!
It’s intriguing and horrifying!

>>9398087
Not in the next 75 years

>>9398109
>>9398111
Thanks...

I probably won’t live to see the furry apocalypse...

Yay!

>>9398073
underrated post

How do humans build underwater motorways (tunnels)?

>>9397218
is that mathematica?

>>9398391
No dumbass it's GNU/Octave, a FOSS alternative to and reimplementation of Matlab.

>>9398449
So it's freeware trash? Got it.

>>9398449
why so much hate

If a set of numbers has a minimum, maximum and median, what fancy name is there for the 1/4 and 3/4 values?

>>9399213
First and third quartile.
And median is the second quartile.

If there is a sound energy, why isn't there a smell energy?

>>9398460
>doing "science" with closed source garbageware
[math]\displaystyle\rm {\color{red} A^{\displaystyle \color{yellow} u}}_{\displaystyle \color{green} t} \color{cyan} i^{\displaystyle \color{blue} s} \color{magenta} m[/math]

>>9399219
Thanks my dude, hope you live a long and amazing life.

>>9399228
he could be a killer, you know, just saying

>>9399222

>>9396445
first you lose the high frequencies, and the ability to listen to people talking
later you lose all frequencies

but this is most generalizing

>>9394767
don't you mean liquids? liquids have no "grain size". so, in the smallest grain size.

>>9399238
Let me reiterate.
>putting scientific results in the hand of unauditable software which will never ever be proven formally to give correct results
[math]\displaystyle\rm {\color{red} A^{\displaystyle \color{yellow} u}}_{\displaystyle \color{green} t} \color{cyan} i^{\displaystyle \color{blue} s} \color{magenta} m[/math]

>>9393994
thalamus and cortex

Is there an advantage to getting a double major in terms of employment?

Will a CS + mathematics major have better job opportunities than just a CS major, for example? There's so much overlap that it looks like you only have to take several additional math classes to get the double major, so maybe employers know about this and don't really give a shit about your additional degrees.

Where/how do I get up to speed on highschool math again? Been wagekekking for years, want to go to uni now.

>>9399261
>”look at me mum, I can use latex!”

I'm going to helicopter pilot school (military fag) early next year and will need a degree to advance my career. I have a lot of interest in mathematics and physics but am unsure of what to pursue that will relate to my career the most.
What do I choose?

Why does crypto currency have any value behind it?

>>9399627
>Why does crypto currency have any value behind it?
Same as other money: because others will exchange something else for it

>>9399547
engineering

I am using R for basic statistics and I would like to know more about the following two claims I picked up:

- The linear model regression function lm() determines an intercept and a slope. The intercept is the same as the mean of the predictor, and is the same as a regression of the predictor to a vector of all 1's.

- Regression in N variables can be reduced to a regression N-1 variables, which means regression in N variables can be reduced to repeated regression in one variable.

Can someone point me in the right direction for these questions? Google brings up a lot of stuff but most of them are tutorials which avoid these questions.

>>9393467
Why is that a z^3 in the denominator, should it not be z^2? Sorry to keep posting these but this book is fucking full of typos and a lot of the solutions are wrong

>>9399813
>should it not be z^2?
Obviously

>>9399813
Of course it's [math]z^2[/math]. Derp.

>>9399264
99.5% of CS double majors half ass their second major. Just do math if you're not a brainlet.

Stats question here, I'm having a debate.

If you have some kind of dice roll with an 8% chance of winning, if you roll the dice 5 times, will you have a 40% chance of winning at least once?

>>9399835
binomial distribution

>>9399827
>>9399832
thanks just wanted to be sure

>>9399839
thanks, I thought it was wrong, since it would be over 100% if you did it 13 times.

>>9399262
Thank you

>>9399867
That thinking error is actually calculating expected values, not probabilities.

Is there a meaningful difference between an ordered set and a sequence? Why do they have different notation?

Where does calculus 1 get hard? We haven't started integrals yet, just gone through derivatives and the furthest we've gone is the chain rule so far. I ask because people always say 'make sure you do the calculus homework and practice a lot, otherwise you're fucked'. But so far, all of this early derivative shit seems easy. When does calculus start getting tricky and requiring practice, and what are some good online resources for building my calculus skill?

>>9400225
I struggled with integration

California university student here. How fucked am I? I won't be graduating until the end of 2018 to the first semester of 2019.

Why is the level of the drink in the straw perpendicular to the straw instead of being parallel to the surface of the rest of the drink?

>>9400225
Series.

StringReplace["<!!!>>{}<>", {"!>" | ("<" ~~ Shortest[___] ~~ ">") -> ""}]

why won't it replace "!>" first?! i was under the impression that it went from left to right. it spits out ">{}" but i expected "{}"

>>9400242
surface tension

Explain where my logic is wrong.
Let [math] A [/math] and [math] B [/math] be arbitrary non-empty sets. Then [math] A, B \subset A \cup B [/math].
Now take [math] x \in A \cup B [/math]. By definition, [math] x \in A [/math] or [math] x \in B [/math]. Therefore, [math] A \cup B \subset A [math] or [math] A \cup B \subset B [/math]. Hence [math] A \cup B = A [/math] or [math] A \cup B = B [/math] but [math] X \cup Y = X \iff Y \subset X [/math]. Thus [math] A \subset B [/math] or [math] B \subset A [/math]. We conclude that given two arbitrary non-empty sets, one is always a subset of the other.
I know it's wrong but I have no idea why.

>>9400410
WHY DON'T WE HAVE STANDARD LATEX?!

Let [math] A [/math] and [math] B [/math] be arbitrary non-empty sets. Then [math] A, B \subset A \cup B [/math].
Now take [math] x \in A \cup B [/math]. By definition, [math] x \in A [/math] or [math] x \in B [/math]. Therefore, [math] A \cup B \subset A [/math] or [math] A \cup B \subset B [/math]. Hence [math] A \cup B = A [/math] or [math] A \cup B = B [/math] but [math] X \cup Y = X \iff Y \subset X [/math]. Thus [math] A \subset B [/math] or [math] B \subset A [/math]. We conclude that given two arbitrary non-empty sets, one is always a subset of the other.

>>9400421
>Therefore, A∪B⊂A or A∪B⊂B.
Does not follow.

>>9400421
>Therefore, A∪B⊂A or A∪B⊂B
wrong

>>9399221
Smell is the sensitivity to the local chemical environment. Shit floats into your nose, and the nose cells do their thing and tell you about it. The things you smell are floating in the air. Because of this, we can consider the entropic effects of the shit floating in the air. For example, there is an entropic change in free energy whenever something in the air reacts with your nose. I think we should do some experiments and call the resulting total energy change over some period of time smell energy!

>>9400593
>I think we should do some experiments
braap?

>>9400327
>>9400242
acually it's between perpendicular and parallel

>>9394412
log means base e in the US, everybody else has base 10.
ln means base e
ld means base 2

>>9399516
Pretty sure the sticky link has some online courses and books. Could always check out community college, I know the one I work at has a college math fundamentals course.

Are Riemann Sums just Calc 1 or is Calc 2 introduced with them

>>9397307
Pls help

Are consciousness and its contents distinct things or one?

HEY

Can ANY math people out there tell me the minimum pre-reqs to learn:

>Topology
>Topological Data Analysis
>Graph Theory
>Real Analysis

THANK YOU

>>9401226
Calc 3 and Linear Algebra

>>9400614
>log means base e in the US, everybody else has base 10.
Wrong.

>>9401115
>consciousness
not science or math

Completely disregarding enjoyment and all of that, what's the major that will have the most jobs easily available after graduation and also be the highest paying?

>>9401494
Unless you're part of the 0.05% brilliant mathematicians and computer scientists who are fit for becoming traders, engineering.

>>9401494
Accounting

Brainlet here, I have a question. Let's look at this algorithm.

We could try all possible orderings of the points, then select
the one which minimizes the total length:
d = ∞
For each of the n! permutations Πi of the n
points
If (cost(Πi) ≤ d) then
d = cost(Πi) and Pmin = Πi
Return Pmin

Since all possible orderings are considered, we are guaranteed
to end up with the shortest possible tour.


The instructor asks "How many different orderings are there, on these n points?" He then proceeds to say " (n-1)!/2 orderings" as the answer. Can someone kindly explain why? I thought there would be "n! orderings". I know it is a retarded question, but I just want to make sure I understand everything before moving on.
For anyone interested on the lesson:
https://www.youtube.com/watch?v=ZFjhkohHdAA&list=PLOtl7M3yp-DV69F32zdK7YJcNXpTunF2b

>>9401382
only because science can't explain it

isn't CS going to get flooded with undergraduates soon? feels like everybody's going for it nowadays.

>>9401670
It's been flooded for decades, retard

>>9401670
Yes but CS jobs are growing
Also a lot of retards go into CS and can't be bothered to study so they drop out

>>9401698
t. Me

I can’t study programming for shit but excel in Actuarial maths and stats

anybody knows what's the mechanism for this pinner reaction?

>>9401718
>Actuarial maths
No such thing.

>>9401733
just the last step

>>9397200
Any rock monkeys here that can help me?

>>9401735
>No such thing.
What do you mean?

I am feeling more of a brainlet than usual today.
I have to do this:
Show that the function f:R2+ -> R f(x,y) = x^a * y^b
admits maxima and minima on the set D:= {x,y >= 0, x+y =< 1}
Find them.

To show that it admits maxima and minima I applied Weierstrass theorem since D is compact (closed and bounded) and f is continuous.

I am stuck because I can't actually find maxima and minima.

>>9401735
>no such thing as statistics and probability

>>9401810
https://en.wikipedia.org/wiki/Lagrange_multiplier

>>9401810
you're right that the extrema exist because D is compact.
the extrema can be attained either at critical points (both partial derivatives vanish) or on the boundary of D. you should be able to do it now

>>9401823
Thanks, but this will be covered later on in my course (although it does seem that it would solve my problem).

>>9401856
Ok, by making both partial derivatives vanish, I obtained: x = (a/b) * y
Then, I input x+y=1 and found x=(a/b)/(1-a/b) and y=1/(1+a/b)
Can we say that the exercise is concluded?
Thanks

i need some help with error propagation in a salinity equation. at a conductivity of 43900 ± 50 μS/cm and a temperature of 19.1 ± 0.05 °C, i get a salinity of 32.4 PSU. this is using a custom excel function, or any other calculator which does the equation for me.

i'm having trouble figuring out what the uncertainty should be for the equation. i think this is the equation, i can't find any help regarding this on an 89 IQ level that i need:
http://www.chemiasoft.com/chemd/salinity_calculator
but i'm not sure how to apply the basic error propagation principles to it to come up with a number

got a question for any doctors of /sci/, is it okay to put an eye patch on to help prevent the spread of viral pink eye to my other eye, or do I need to give it some exposure? maybe just for the daytime? please help

How do I show that [math]H^1_0(U)\cap H^2(U) [/math] is dense in [math]L^2(U) [/math] for $U$ a bounded, connected open subset of [math]\mathbb{R}^n[/math]?

>>9393598
>>9393703
Isn't it also used to improve smell?

Why i don't have a girlfriend?

How is an analytic function different from a continuous function?

>>9402392
A continuous function may not be differentiable.

>>9402412
So a function is analytic iff it is infinitely differentiable?

>>9402427
This information can be easily found on wikipedia. Give it a try.

>>9402049
becasue ur posting on here on a friday night

>>9402428
>"...any analytic function (real or complex) is infinitely differentiable..."
I apologize for my stupidity.

What the fuck is the point in phasor analysis?

I don't see how it is more useful than, or really even different than, conventional approaches to trig.

>>9401638
He seems to be talking about closed paths so have a look at this: http://mathworld.wolfram.com/CircularPermutation.html
You'll get a 2 in the denominator because presumably the cost remains the same whether you traverse the path clockwise or anticlockwise.

>>9393986
How could they possibly know he was fully conscious

>>9402438
For real functions:
Analytic ==> Infinitely Differentiable
Infinitely Differentiable =/=> Analytic

For complex functions:
Analytic ==> Infinitely Differentiable
Infinitely Differentiable ==> Analytic
AND
Once Differentiable ==> Infinitely Differentiable

>>9393745
Don't use those arrows just put an equal size to left on the next line, then underscore your answer. I know it's picky but it makes the beauty of math a lot easier to look at.

>>9393772
when brute forcing, physics you can approximate things. In mathematics they're used as a basis for a lot of things. Derivatives basically require a divide by zero but limits avoid dealing with that and provide an *instantaneous* rate of change. They're used as a basis for a lot of other things that are pretty interesting if it's your kind of thing.

>>9402429
Same applies to you dosent it?

When finding the distance between two 3D vectors, is it the same as with 2D but with Z?
I.e.
Dist = sqrt((x2-x1)^2 + (y2-y1)^2 + (x2-x1)^2)?

>>9403677
Fuck, last one meant to be (z2-z1)^2

>>9403677
>>9403680
Yes. You could prove it by boxing your points and projecting the segment on the faces of the box.

probably very dumb question.
given a 2d plane, to find whether something is to the left or right of something else, would you simply have to check if that thing's x coordinate is < or > than the other?

>>9403788
>given a 2d plane, to find whether something is to the left or right of something else, would you simply have to check if that thing's x coordinate is < or > than the other?
Yes

if there are two objects with mass m_a and m_b where m_a=4m_b. Now if I was to place a particle inbetween the two masses in the gravitational field, where would it have to be placed to feel a net force of zero? would it be one third away? from the mass m_b and 2/3rds away from m_a I am feeling like a retard trying to solve this.

>>9401955
Use the fact that C^\infty_0 is dense in L^2

>>9401738
why not open a new thread extra for that. it's not a stupid question after all, more an intelligent question.

>>9395116
>>9396483
>>9395133
>>9397481
>>9397513
>>9400225


I'd just like to interject for a moment. What you're referring to as calculus, is in fact, real analysis, or as I've recently taken to calling it,
[math]\Bigg(\mathbf{R},+,\times, \leq, |\cdot|,\tau = \{ A\subset \mathbf{R}\hspace{0.1cm} | \hspace{0.1cm}\forall x \in A, \exists \epsilon > 0 ,\hspace{0.1cm} ]x-\epsilon,x+\epsilon[\hspace{0.1cm} \subset A \},\hspace{0.1cm} \displaystyle \bigcap_{\substack{\text{A} \hspace{0.1cm}\sigma-\text{algebra of}\hspace{0.1cm}\mathbf{R}\\
\tau \subset A}}A , \hspace{0.1cm}\mathscr{L}\Bigg) [/math] -analysis. Calculus is not a branch of mathematics unto itself, but rather another application of a fully functioning analysis made useful by topology, measure theory and vital [math]\mathbf{R}[/math]-related properties comprising a full number field as defined by pure mathematics.

Many mathematics students and professors use applications of real analysis every day, without realizing it. Through a peculiar turn of events, the application of real analysis which is widely used today is often called "Calculus", and many of its users are not aware that it is merely a part of real analysis, developed by the Nicolas Bourbaki group.

There is really a calculus, and these people are using it, but it is just a part of the filed they use. Calculus is the computation process: the set of rules and formulae that allow the mathematical mind to derive numerical formulae from other numerical formulae. The computation process is an essential part of a branch of mathematics, but useless by itself; it can only function in the context of a complete number field.
Calculus is normally used in combination with the real number field, its topology and its measured space: the whole system is basically real numbers with analytical methods and properties added, or real analysis.
All the so called calculus problems are really problems of real analysis.

>>9399919
oh I forgot, and a bit of brain stem is also involved

>>9403895
Yes.
F=G.M.m/r^2 =>
F1=G.M.m1/r1^2
F2=G.M.m2/r2^2

F1=F2 =>
G.M.m1/r1^2 = G.M.m2/r2^2
=> m1/r1^2 = m2/r2^2
=> r1^2/r2^2 = m1/m2
=> (r1/r2)^2 = m1/m2
=> r1/r2 = sqrt(m1/m2)
So if one mass is four times the other, the distance from that mass must be twice the distance from the other. So 2:1 = (2/3):(1/3)

Best high-school level mathematics textbook?

I'm writing a program that assigns tasks, but I think I've run into the subset sum problem.

Essentially a task has a weight, and I want to assign a set of tasks such that the sum of their individual weights is within some lower and upper bound.

The first thing I thought of (which is extremely inefficient) is to:

1. construct the power set (excluding the empty set) of the set of all tasks
2. check the sum of all subsets and add them to some list if the sum is in the desired range.

The thing is there are likely to be more than 100 tasks in all realistic scenarios, so the cardinality of the powerset alone would be at least 2^{100} - 1, and calculating the sum of the subsets would take so long that the algorithm is useless.

Even if this can be broken down to O(2^{n/2}), it's still worthless. I haven't seen dynamic programming before but I have done some stuff with memoization, is it worth a shot to look at DP approaches? Or should I think of something else?

Is rolling a d100 the same as rolling a d10 for units and another for tens?

>>9404387
yes

>>9393467
why do photons not have mass?

>>9404387
If you count 10 as 0 for the second one, yes

>>9404423
It's been experimentally shown that its mass is at most some extremely small number.

All mainstream modern theories treat it as massless.

>>9404478
>All mainstream modern theories treat it as massless.
They're just theories though.

>>9404497
Yeah?

Why don't two objects traveling at, say, 0.7c in exact opposite directions perceive one another as traveling faster than light?

I'm too much of a retard for the wiki page on Lorentz transformations.

>>9404546
There's square roots and shit in the relativistic Doppler shift formula

>>9403999
Author of this pasta here. It would appear you replied to me despite me not misusing the term "calculus." Suck a dick.

>>9404546
because adding vectors in space does not work the same as adding them in spacetime

how do we know the universe is expanding if the oldest light is 14 billion years old?

>>9404623
the redshift of galaxies increases with increasing distance, implying everything used to be closer together in the past

>>9404623
Because of cosmological redshift.
http://astronomy.swin.edu.au/cosmos/c/cosmological+redshift

Is the light created by a small fire the same "type" of light as from the sun? ie. why is it easier to sleep by a bright fire than sunlight

>>9404586
I should reiterate, I am a retard. Is it possible for you to explain it in a way that I can conceptualize it, or is it too far out there?

>>9404675
>why is it easier to sleep by a bright fire than sunlight
Blue light.

>>9404675

Partly. The light of the sun is black body radiation, meaning it simply glows because it's hot. It's the same kind of glow that you get when you heat something in a furnace to glowing (only hotter, surface of the Sun is 6000K). This is a continuous band of radiation across many wavelengths (see figure).

A flame also gives off black body radiation, because the air is heated to glowing. But there is light also from the chemical reactions happening (oxidation of the fuel), which has just a few very well-defined wavelengths in which the color peaks. This is why manganese burns bright white while sodium burns yellow, it all depends on the relative energy levels of the oxidation reaction.

It's a bit of a complex mess since there's burning soot flying around and gas-phase reactions etc.

But short answer: a flame is not as hot as the sun, so the black body radiation will be less intense, and you have chemical reaction induced radiation as well.

>>9404710
>>9404706
So how hot would something need to be to emit this the kind of light that keeps you awake

>>9404718

According to the chart about 4000K

>>9404718
lambda = sigma * T^4
sigma = Stefan's constant
idk what units lambda is in so you might have to convert
just solve for T

>>9393781
My friend was taking phenibut for two years straight as a coping mechanism for his anxiety, and when he tried to wean himself off of it he spent a week in the hospital in total deliurium. It was actually pretty funny, but I do not reccomend

>>9393771
Heres my other reply to phenibut:
>>9404772

You’re going to have to get comfortable being uncomfortable. Medicinal solutions don’t work, so you’re going to have to address the issue from it’s very core.

You are not social, yet desire to be. Say hello to some people, smoking weed is pretty social but I don’t reccomend if it will raise your anxiety (so smoke indica haha), get drunk with people at some point. Yes, some people probably will think you’re weird in whatever regard, but to be honest, people are so caught up in the image of themselves that no one really gives a shit who you are. We are selfish creatures, and only truly know ourselves.

I can't understand your situation because I am not you, but I do struggle with social anxiety to a lesser degree. It’s ok to be introverted, but if this anxiety stems from self-consciousness, it’s unhealthy to harbor it and bury it deep down. Love yourself, then you can learn to love others :)

If all else fails, take psychedelics (to learn from the experience) and/or become a monk. I bet you have some cool insights that you don’t even know you have. Solitude is a bittersweet melody for the psyche

>>9393771
I would recommend going with the flow. In social situations don't try to make things go a certain way, just speak your mind (unless it's inappropriate). And don't assume things about other people, especially don't assume they think something about you (unless you really know). Like for example, don't assume that girl thinks you're ugly unless she straight up tells you you're ugly (or at least hints).
In social situations (unless it's some high class shit) it's ok to be impulsive, just don't be crazy.

sonar vs radar vs echolocation

Is any research experience, even if outside the field of studu I want to enter, better than none for grad school applications? My uni has a good EE department in terms of how many different specializations and courses are offered and also for job placement, but there arent really any opportunities for optics/photonics research. Physics department has some lasers/optics faculty but have been full with people or just say im not ready yet (almost will be). I am now looking at bioengineering or materials shit and a new professor at the university has a spot for me if I want, but is it worth it or should I focus on studying until more relevant opportunities arise?

If, for some set(/type/collection) X I've already constructed an injection [math]c:2^2 \to X[/math], can I use it to construct an injection [math]i:X^2 \to 2^X[/math]?

(Here I'm using [math]B^A[/math] to denote the set of all "constructible" functions from A to B, but leaving the definition of constructibility to the metatheory.)

The obvious answer is to assume a metatheory with excluded middle + axiom of infinity + axiom of choice, use the first two to split [math]i[/math] into the two cases where X is finite or infinite, then handle the finite case directly while invoking choice for the infinite case (in the form of an injection [math]X^2\to X[/math]) which is then composed with the embedding [math]X \to 2^X[/math].
But surely these three can't all be necessary, right?

>>9401382
Everything is math

>>9404873
No everything is science

>>9404845 here, upon further reflection "metatheory" is a wrong term: "background theory" is what I was really going for.

>>9404234
What's wrong with the usual heuristic approaches (e.g. greedy algorithms)?
Even with sufficiently large resources you'd need to write an exception to handle the case of no-possible-assignment, so in practice you could just replace that with a timeout instead.

>>9404875
No, all information can be described with numbers, all numbers are mathematical, and everything is information therefore everything is math.

>>9404884
>all information can be described with numbers
[citation needed]

>>9404884
you might have to do some science to back up that claim

If [math]|x-a|<r[/math] and [math]|y-b|<r[/math], what is an upper bound for [math]|x^2-y^2[/math]?

>>9404913
>a=x
>b=y
x^2-y^2 can be anything

MRI works on the basis of the blood in the brain having a magnetic signiture, right?

Why isn't information/data stored using magnetism at the quantum level?

Bear in mind highly powerful magnets can affect the brain if concentrated (Experiment showing subconscious decision making was influenced by a magnet) so I'm a little confused at how these all connect.

>>9404967
MRI doesnt work like that.

Why is transformation efficiency for cell intake of plasmids better given in cfu/pmol rather than cfu/μg of plasmid?

Is heat (that we get from sun) goten by light or heat waves?Becose cosmos dosent let heat get to earth, it isolates it, so the only way energy can get to earth is by radidiation (which is blocked by oson laer) and light

Why i dont have a girlfrend?

>>9405025
girlfiends are for normies
just fap

Why are heroin addicts prescribed ((((methadone)))) when it seems even worse than heroin?

I must prove that the linear operator [math]A:H^4(\mathbb{R},\mathbb{R})\to L^2(\mathbb{R},\mathbb{R}) [/math] defined by [math]u\mapsto -(1-\partial_{xx}^2)^2u [/math] generates a [math] C_0 [/math] -semigroup on [math] L^2 [/math].

I believe that we also got hinted that Fourier transforms are needed here, but I have no idea how and if the Hille-Yosida is still necessary after applying Fourier transforms.
Could anybody give a verbal outline of the proof so that I can understand what should happen here?

>>9405422
I am not educated on the topic but it may be becose methadone is just a fancy narcotic that hospitals use for rehabilitation of adicsts, imagine if hospitals would give heroin addicts just heroin.

>>9404913
Using triangle inequalities:
[math]|x^2−y^2|=|(x-y)(x+y)|=|x-y|\cdot |x+y|\leq (|x-a|+|y-a|)(|x-b|+|y-b|)<(r+r+|a|)(r+|b|+r)=(2r+|a|)(2r+|b|) [/math], because by the inverse triangle inequality we have [math]|x|\leq r+|a|
[/math].

>>9405712
I meant [math]|x|< r+|a| [/math], which is because [math]|x|-|a|\leq ||x|-|a|\leq |x-a|< r [/math]

>>9405714
[math]|x|−|a|≤||x|−|a||≤|x−a|<r [/math]*

Is there any major difference between the Casio FX-85GT Plus, FX-85DE Plus and FX-85ES Plus? Seems like just the language and the prices are different but I might be mistaken.

>>9393467
If I wanted to change the world in a good way to benefit our society would it be better to major in Mathematics or Physics?

>>9405476
Brainlet

>>9405831
Prove it then if you aren't one.
(Protip: you can't, because you are a brainlet.)

>>9393467
Does the moon have a moon?

>>9405850
Have you ever heard of a Fourier transform?

They don't call me The Brainlet Exterminator for nothing.

>>9405861
Have you ever heard of Optimus Prime?

>>9405861
Ah you think a Fourier transform is your ally? You merely adopted Fourier transforms. I was born in it, molded by it.

They don't call me The Phenotype for nothing.

>>9405852
No.

>>9405815
Medicine.

>>9405025
>Studying number theory
>Still haven't gotten a girl's number

>>9405022
It's all just electromagnetic radiation.

>>9404053
SICP

>>9404234
Do you need *a* subset that fulfills your conditions? If so, just do greedy. Do you need *the* subset that it's in some sense optimal? Then you're likely to fall into the knapsack problem, which is NP complete. You'd be better of with some heuristic approach. If you need *all* such subsets, obviously worst case is going to be exponential.

>>9393467
How pretentious do you have to be to think you actually know what's going on inside the sun?

>>9406069
A sun of ice or a sun of lava?

does potential energy actually exist or is it just an abstraction

>>9406100
Potentially

>>9406052
COULD the moon have a moon?

>>9406185
Good question
There are asteroids smaller than the moon that have moons but I think something about the Moon being in orbit with the Earth that would make it hard for the Moon's moon's orbit to be stable.
Run a simulation (see perturbation theory).

>>9404691
in spacetime vector add in such a way as to not go over c.if you've seen the coordinates x y z that's space. adding a -t to it to make -t x y z (t -x -y -z for some people) makes it spacetime. you can add vectors in this with the relativistic vector shit that is just a consequence of the spacetime coordinate system

if you want a conceptualization then things have to shrink in space to make up for the fact you can't go faster than the speed of light

I only really do anki decks for non mathematical things, and just solving dozens of problems until I understand shit for math. Are these enough? How else do people 'study'?

Also, what should my anki targets be for grinding anatomy and physiology?

could someone explain to me why is the bond cf3-cf3 non-polar? F has highest electronegativity so shouldn't it be extremely polar?

>>9406440
>solving dozens of problems
>"""understand""" math
That's not how it works. Doing mindless calculations does not lead to understanding of math.

>>9407111
Because the molecule is symmetric

Anyone have experience in engineering in the UK and the US?

Just graduated masters in mech eng and working in aerospace in the UK but apparently you get paid much more the US

Would you recommend working in US or not?

Anyone help? Looking for the most mathematical accurate way to shift one function onto another. Moving averages are easy, but not enough.

>>9407121
I studied Aero Eng, worked in UK for a few years and then shipped out to Canada.

I would recommend getting started in the UK for a few years and then making a switch abroad if you're still interested. There are several reasons.

- Moving is both time and money. Canada was bad, the US will be worse. You can apply for an IEC visa to Canada that is very cheap for British and it'll get you two years. But...
- You have no experience. Why would a US company hire you without any experience because they can a) hire American, b) hire a cheap Pajeet and c) know that you'll be forced to leave under visa restrictions in x years/months?
- You likely won't get a visa in the US without a company sponsoring you. Why would they sponsor a graduate with no work experience?
- You're also covered in the UK under job seekers if you don't find a job. In the US/Canada you're alone. You need $$$ to set-up, rent deposit, rent, travel. It'll all be spend until you find a job.

Ask away, I'll be here for a few hours.

>>9407133
I'm going to stay for a couple of years in the UK. I should be able to get a job with the company I'm at, they have American offices too and pay towards moving which is nice.

You reckon the pay is actually more after all tax rent etc?

Also most importantly desu, where did you enjoy living the most?

Cheers

>>9407144
I think you over-estimate how much European branches talk to American branches. There is often little communication between them. If you plan to move, good on you if you can move with your company. Don't make all your plans on it though

Pay is a little different. In the UK, I started as a graduate on 25k GBP, quickly moved to 38k GBP after three years. My mates in the UK now are on about 42k GBP. I get about $90k CAD, or about 55k GBP, but my cost of living is much more. All in all, it's about the same I reckon.

I enjoy both the UK and Canada for different reasons. I like the UK because of the people there and that we'd all head down the pub after work, have a few and go home. Canadians don't do that. In Canada though, I have my firearms and truck. It's urban city living which is comfy.

>>9407133
Is it only a phase difference between the functions or do you need to make some amplitude adjustments etc as well?

>>9407168
Thanks for the advice, I'll look into it closer to the time. I just don't want to be stuck in Derby for my whole life lol

>>9406440
"this is thing"
"i understand thing"
no need to grind

Which object provides better job opportunities and general flexibility; Chemical Engineering or Chemistry?

>>9407169
Phase difference only as far as I'm aware.

>>9407183
> Derby
I had a mate that worked up in Derby at RR through AsSystems. If you go through a contractor, prepare for a royal arsefucking. They will work you to the bone and fire you on a whim. Try and stick tier-one suppliers unless you are finding it hard to get a job.

Graduate scheme really is the best way. You do fuck all for two years and get a relatively nice pay out of it. They'll start hiring around March and into the summer. Have a look in Bristol / Gloucester region for companies like Airbus, Safran, Triumph, RR, etc. There are also a few defence companies like MBDA and BAE about the country.

If you do get a cushy graduate job, spend the spare time learning to programming. It's really increased my salary by being an educated engineer capable of writing software.

>>9407216
Chemical Engineering is more practical. GFs father is a chem eng, he earns $250k out in the middle-east in oil.

Is 26 too old to grok pure maths?
As a young physics student I tried to into fundamental mathematics (for mathematical physics) and failed.
It feels like such a different way of thinking that it needs to be one of those things you learn early like before 22. I've definitely noticed in my current area of expertise which is programming, people who came at it after that age are shit and just don't "get it".
I have a stable job and no more depression so I can try again at my own pace and do it properly this time. But I've tried starting this book a few times and I just don't grok it (might just be a shit book though)

>>9407222
funnily enough I'm on the grad scheme at RR already, that's why I'm in Derby, just interested at other places I could work in the future.

It's seems it's very cushy, people can't be arsed moving and then before you know it you've settled down and never lived anywhere else.

I was never a big fan of programming but all we did was Matlab, suppose I should look into it more.

>>9407224
>undergraduate
Yes, this books indeed seems to be garbage.

>>9407239
>I was never a big fan of programming but all we did was Matlab, suppose I should look into it more.
Stay away from statistical languages and more towards scripting languages. In aerospace, VBA is King. VBA knowledge alone will increase your salary by orders of a few grand.

If you want to have fun an learn, python or java. This will also allow you to move into the finance industry later.

Other things I've learned to be useful in aerospace that now would be a good time for you to learn
- SAP transactions and SAP software
- Catia, if you want to be a methods engineering monkey
- get a good knowledge of simple mechanical work like riveting, clearances, etc. Nothing destroys credibility more than an "engineer" not knowing basic manufacturing processes. Be able to read a drawing.
- a thick skin. Learn to pick fights and sides. From here, half the battle is picking a winning side and riding it up the corporate dick sucking ladder. Aerospace especially. Most people try and avoid arguments or else let their tempers control them. You need to be comfortable with arguments.
- start with iMechE or royal aerospace society and get your Chartership now. Make sure you document what you did every 3 months, because in 3 years you won't remember a damn thing you did.

>>9407245
Are you saying its bad for undergrad level learning, because that's basically where I am in pure mathematics knowledge.
I did theoretical physics but it was still a physics degree. No formal proof writing etc.
I'll try another source.

>>9407239
>I was never a big fan of programming but all we did was Matlab,

Ouch.

Yeah learn something proper while you're still young and malleable. I learnt C# when I graduated around 23. Pick a modern popular big OOP language like that. Java, even python will do (though I think its too high level to learn fundamentals).

Learn while young.

>>9407246

Seems to be true with VBA, everything is done on excel.
Yeah I'm going iMechE, already will be doing quarterly reports and all that so that's sorted
Thanks for the other advice, I'll definitely have a look at learning some coding

>>9407250
>Are you saying its bad for undergrad level learning
The vast majority of "undergrad" books are basically garbage written in a retarded manner.
>because that's basically where I am in pure mathematics knowledge
That doesn't mean you should avoid books marketed towards "graduates". You can pretty much read any introductory text if you have basic mathematical knowledge (what exactly constitutes a proof and so on) and basic understanding of the language of set theory.
>I'll try another source.
What topic are you mainly interested in? Do you just want to learn about pure mathematics?

>>9407298
>Do you just want to learn about pure mathematics?
In general yes. The eventual aim would be topology and all the fun stuff for Relativity, but I've met many math majors who said that stuff was insanely difficult so I'm starting with just building a mathematical base.
I attacked it as a student from a physics perspective but I never satisfactorily understood it, and I don't have a passion for experimental physics. So that was that.

>>9393598

>>9407309
You could try pic related and Mathematical concepts by Jürgen Jost, both are on libgen.
>who said that stuff was insanely difficult
I don't think that's really the case as long as you aren't talking about research problems. You should try it later and see for yourself.

>>9404845
cute image. do you have more?

NEW
>>9407472

>>9406440
Doing problems is generally helpful for understanding math concepts. You need to explore them on your own and get a feel for them; that's what problems are for.

"I hear and I forget, I see and I know, I do and I understand"

>>9406052
Ideally I'd get all of them but that's just not feasible, I would at least need a couple of subsets so what I'm thinking of trying now is breaking it into smaller problems.

Ex, instead of 1 powerset of 2^50 subsets, I would have 5 powersets of 2^10, then I would combine the results if possible