/sci/ - Science & Math

request maths book art

I've been doing a chapter a day from a math text. I don't really feel like doing that today though.

Say I have a manifold X embedded in Rn. How can I show that for almost every v in Rn the vector field gotten by orthogonally projecting v onto TpX for various p in X is transverse to X?

OK /sci/, I'm taking Mathematics II this semester, and the professor wants us to buy some shitty book his colleague wrote. I'm looking for a alternative. The topics are: Complex numbers-basics. Matrices. Elementary transformations of matrices. Applications of matrices. Theory of number series. Conditions for series convergence. Series form of functions. Functions of more variables. Partial derivatives. Jacobi's matrix. Extrema of functions of more variables. Double, triple and ... integrals.Curved line integrals. Surface integrals. Differential equations-basic types and their solutions. Differential equations of a higher order. Systems of differential equations. Special functions. Elements of probability theory. Thank you in advance!

if I want to educate myself in mathematics just out of interest, would simply buying a school textbook and going the work on my own suffice? If so, do you guys have any textbook suggestions? I'm looking for math at the high school level. maybe calculus, since I never did that.

is 57 285% more than 20 because 57 divided by 20 is 2.85?

>Applied to a nearby community college for computer science
>Only recall doing basic algebra, dropped out in 9th grade, got my G.E.D.
>recently informed I may need to take algebra 2 and pre-calculus before I can start the computer science

Basically, I need a good book on algebra 2 and pre-calculus to learn from, in the hopes that I can cram enough information from now until my placement test, and can avoid spending a semester playing catch-up.

I didn't know where to ask this so I did on /g/ they sent me here.

Need Help.
Dunno if this goes here but...

2 cos(3x) - 2 sin (3x)
Simplest Form?

I'm currently an undergrad in engineering and was considering going to grad school for math. Anyone do this or can tell me anything about doing this sort of thing?

Hi,

I've decided to go back and relearn everything slowly, doing every odd problem in the books i have.
Are there any better books to learn from?

Thanks.

Hello, /sci. I need some help. I'm trying to create a rather complex system and I've tripped over something that my brain doesn't seem to be able to handle.

Basically the system would have a number of clients. Those clients can have many customers each. They would get billed as the customers use the system's requests. Now, here's the tricky bit. The more customers use the system, the less the client pays _per request to the system_.

This is a very simplified pattern:


100 1,25
1 000 2,5
10 000 5
100 000 10
1 000 000 20

There are two columns. Left one is the number of requests made, right one is the price multiplier (if you wish, imagine it's just dollars).

Basic explanation of the pattern: If a customer gets 100 000 requests to the system (exactly) by users, they are billed for 10 dollars, which is 0,0001 dollars per request. If customer gets 1 000 000 requests (exactly) by users, they are billed for 20 dollars, or 0,000002 dollars per request.

My problem is finding the underlying formula to that pattern, so that I could calculate the exact price to any random number of requests, instead of hardcoding the limits so that 100 000 requests would be 10 dollars but 100 001 requests 5 with pennies.

I'm relatively good at math, but unfortunately... this seems to be my limit. I've asked several people that have more education in math than I do, but none of them are able to solve it either.

Hi all,
Need help with the quadratic formula
>ax^2 + bx + c

If 'a' is the vertical stretch and 'c' is the Y-Intersect, what would you call 'b'?

Thanks!

I just started my senior year in applied mathematics.

I can't help but feel that it's been a waste of my time. Despite maintaining a high GPA, I can honestly say that I hate math and suck at it. Most of my mathematical education has been memorize and purge. Anything that requires deep thinking, I (and my classmates) can't do. I have completed maybe 2 proofs in the previous 3 years. If I get a proof question on a homework assignment I ignore it because there's no way in a hundred fucking years that I would ever think of the answer. I feel like I should have been an engineer or an applied scientist, really. Using math as a tool to understand the real world > being a clueless retard, unsuccessfully trying to prove something that's barely understandable.

Does anyone else think like this, or am I alone?

hey. need help on this shit.

someone factor this please? step by step process would help too.

(3y^4)+(6y^3)+(15y^2)-(3y)+(21)
parenthesis added for clarification.

I start multivar next semester, how should I prepare?
I'm on winter break. I have the book, and most of the shit seems really easy. Just calc 1 and 2 done over with more variables.

What's the balls of calc 3/multivar?

(Got As in calc 1 and 2)

I have a number theory question for you guys...
If integers a,b have a gcd of 1 and ab=c^2, how can I prove that a and b are squares of integers?

the next step would be to distribute the variables, right?

<span class="math">AB=\sqrt({x}_{2}-{x}_{1})^{2}+({y}_{2}-{y}_{1})^{2} \\ AB=\sqrt({4}-{1})^{2}+({2}-{1})^{2}[/spoiler]

Well school is starting and I taking math again.

A little back ground storyl

Have taken math 3 times and failed each, I reached a point in which I can't take anymore classes without taking math. I am taking MAt0020.

I have every other prerequisite except math, in order to get my AA.

So my question is: Any good math sites online?
For someone who is stupid in math?

Thanks Chris '

I'm interested in advanced mathematics. I've been studying using websites and wiki articles, and I'm currently reading a textbook on measure theory.


Could I have suggestions for good textbooks on advanced math topics? Any field is good, as long as it's self contained and introductory, because I haven't had any formal math education beyond high school.

Also, I would much prefer textbooks that have exercises and solutions in them.

I need some help with a Second Order Differential Eqn represented as a Series.

My work is at mathbin(dot)net/56336

Can someone tell me if i'm correct so far? If not, where I screwed up?

|2x + 4| + |2x − 3| = 4x + 4
halp plox
I tried saying that each of the the inside absolute values is either positive or negative but I end up screwing something up.

Why do math books suck so much? I don't believe I've read a single advanced math book that did not suck. Most math books are just lists of problems, with partial solutions and explanations and then some stock photos and bullshit non relevant writing thrown in.

Does anyone have a PDF version of the 7th Edition of Transition to Advanced Mathematics by Douglas Smith and the solutions guide to Linear Algebra: A modern introduction 2nd Edition by David Poole?

I REALLY need those two books. Both are expensive and out of my range, so I'd appreciate it if someone had the pdf form or version. If not, I'd appreciate, at the very least, an answer to a few questions I have from the Linear Algebra book.