/sci/ - Science & Math

What do you guys think about zimbardo's time perspective thing?

It seems revolutionary. Why hasnt it even got a wikipedia page? am I missing something?

Is this something my bullshit detector failed to detect?

can people smell the sperm on my pyjamas? Can I pass it out as sweat or are these both distinct smells? I have a poor sense of smell.

If you wanted to take a small group to a convention on someone else's dime, where would you go? Have a club looking to go on a trip, looking for suggestions.

tgα+tgβ≥2 can /sci/ prove this for me?

If I know the determinant of a matrix A = 4, then is the determinant of A^4 = 4*4*4*4?

hey guys I got a quick question regarding excel.

I'm trying to use the built-in trendline feature to find the best value of 'a' for my model form y=1/(x+a) in a least-squares sense for the following set of data:

x: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50

y: 0.077, 0.055, 0.044, 0.033, 0.03, 0.027, 0.022, 0.021, 0.019, 0.016

the trend seems logarithmic to be but I'm ideally trying to fit that function to the data. Any suggestions?

thanks in advance guys

Hi. I'm seeking some advice from any physicsfags around.

I'm graduating next semester with a math degree but I need some science credits. In particular, I need some physics credits. What I would like to do is an independent study in mathematics but pawn it off as a physics department course to get the science credit. So, this leads to my question. What areas of mathematics are invoked regularly in physics that may be related to some math that would be familiar or reach to me. I have experience with the basics: real & complex analysis, algebra, number theory, and topology.

It seems to me that areas like theory of PDEs would be very relevant in physics. As for other areas I have no idea- i've only taken the introductory courses which have only used calculus. Any ideas?

What would 2e+43 look like in terms of numbers? It would be the rough estimate of solar systems in the observable universe.

One of the professors in my department (chemistry) is leaving. I am really sad.

(n+2)/(n+1), sum of all terms from n=1 to n=49?

books, articles, etc on Nuclear Physics and stuff? i find it really interesting.

sup /sci/,

I'm finding resistivity of a wire and I'm finding resistance from V/I. The two meters read to 2 d.p. - is that a 0.005 uncertainty? also how would I work out the total uncertainty of the resistance? just add the individual ones?

Hello guys, quick question, as google led to no results. Is there a way of constructing an alternating series knowing what it will converge to? For example, could we create an alternating series that converges to 1, then change it to converge to 2, then 3, etc. I haven't found anything about being able to create alternating series, nor have I found a list of known alternating series.

Pic unrelated.

Hi everyone.

I'm 18 years old, and I started getting episodes of insomnia in early January (I was 17 at the time, my birthday is in February) and in February it developed into something more persistent. I tried diphenhydramine as well as melatonin and nothing seems to be helping me. I feel deprived of motivation, no libido, and dumber than ever before. It is now March, and although the insomnia has been somewhat alleviated, I still don't get enough sleep during the night. I have accumulated an overwhelming amount of sleep debt and I feel absolutely dead mentally. To worsen my situation I have school to tend to as well, (and they are AP classes). I want to return to my original mental state very much. I wanted to know whether insomnia causes permanent/irreversible brain damage (especially at my age since I'm only 18 and my brain is still evolving). I sleep better now, but I still feel tremendously burdened mentally by brain fog due to my sleep debt. Please reply asap. Your feedback will be immensely appreciated.

What exactly does "implies" mean?
Is it the same as "and"

A(intersection)B = B(intersection)C -> A=B

Ahat does it mean?

http://www.youtube.com/watch?v=8hR4C4iMe3E&list=PLKaMVzmGcqBIxU1cT3-BnRB8IIjsPtwoS

x^4-y^4 factor please help

There was this one episode of Mythbusters where Jamie took four of the units that make the microwaves out of microwaves and put all four into a microwave of his own. He then put a glass of water in it and turned it on for a minute. When they measured the temperature afterwards, it was 2 or so degrees colder than before. Question is: why the hell did this happen?

Little Mathematical challenge for those of you interested:
Prove that "<span class="math">\displaystyle\sum\limits_{k=1}^{\infty}\left(\displaystyle\frac{1}{k \cdot x^k}\right)=\ln\left(\displaystyle\frac{x}{x-1}\right)[/spoiler] is true for any real "<span class="math">x[/spoiler]" greater than 1.

Only rule:
>Don't use Taylor series

Good luck and I will post my solution when a few of you post yours.

I was wondering, does anybody from /sci/ know why the sky has the color blue?

Sup, /sci/. Doing some math papers to make sure I don't fail the semester.

What's your go-to studying/cramming music?

>>5210930
Bamping with Windows 7 pictures

What other theory can explain the huge leaps in technology that we have taken? I don't think there is a better explanation than Ancient Alien theory. Can you give me some examples that might disprove this theory?

morning guys

Would really appreciate if someone would take a look at this problem for a second.

We have <span class="math"> \int_\gamma \frac{dz}{z^2-8} [/spoiler] where <span class="math"> \gamma [/spoiler] is the circle <span class="math"> |z|=2 [/spoiler]. The integral is made trivial by Cauchy's theorem, since the function is holomorphic inside the path. So, the answer is 0. However the question asks us to evaluate the integral using Cauchy's Integral Formula, which is:

<span class="math"> f(z_0) I(\gamma;z_0)=\frac{1}{2\pi i} \int_\gamma \frac{f(z)}{z-z_0}dz [/spoiler]

Does anyone see a way to show this integral is zero by cauchy's integral formula?

thanks in advance