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Common math questions, quality answers.
Jul24-14 10:02 AM Greg Bernhardt 
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Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed.
Aug5-14 02:05 PM fredoniahead 
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All math courses. PDFs, tutorials and web links.
Aug13-14 05:16 PM seouldavid 
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Jan16-12 Greg Bernhardt
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:23 AM
micromass
1 38,784
I want to take an image and make it kind of wavy to distort it (like in a capcha form the letters are distorted...
Sep6-12 10:43 AM
RusselMorty
2 1,208
A friend posed this just for fun but now its really annoying me. how do you divide 90 into three parts so that each...
Sep6-12 01:50 PM
phinds
4 871
For a general family of dynamic models, xk+1=f(xk), oscillation can occur; for example, the function xk+1=xn2-1...
Sep6-12 02:44 PM
camjohn
11 1,449
Hello i want to know if we have a series with this equation...
Sep6-12 03:29 PM
mathman
6 830
I'm attempting to convert the following parametric equation into into one f(x, y, z), and am running into difficulty. ...
Sep6-12 07:34 PM
chiro
7 2,572
Hi, I need help about the convolution of 3 functions as shown in attached file via FFT. Specially I need help...
Sep6-12 11:55 PM
salzrah
1 1,038
1 = 1 1 - 2^2 = -(1+2) 1 - 2^2 + 3^2 = (1+2+3) 1^2 - 2^2 + 3^2 - 4^2 = -(1+2+3+4) and so on. I have to prove...
Sep7-12 03:23 AM
Venomily
4 799
In inner product spaces of polynomials, what is the point of finding the angle and distance between two polynomials?...
Sep8-12 07:00 AM
chiro
1 1,327
Hello everyone, I'm beginning a research project for a Math History class on Archimedes. Since technically it is a...
Sep8-12 07:38 AM
coolul007
3 918
Hi everyone! I'm a new user of this forum! I was interested in learning to make proofs of the various theorems. Is...
Sep8-12 11:51 PM
Matt Benesi
8 963
Hello, I'm wondering if a common assumption is correct: if the odds of winning a lotto game are, say, 1,000,000:1,...
Sep9-12 11:23 AM
Pengwuino
1 729
Well, I found this challenge in another forum (not about math) on the internet, and, originally, there were no 'w',...
Sep9-12 04:07 PM
henrique_p
12 1,996
H is a contravariant transformation matrix, M is a covariant transformation matrix, G is the metric tensor and G-1 is...
Sep9-12 07:59 PM
nigelscott
8 1,249
When I was little, I noticed that any even number less than 10 multiplied by 6 ends in itself and leads with one half...
Sep10-12 05:17 AM
arildno
2 638
Hi everybody !! I have a question about discrete integrals with contours. I want to integrate the points that...
Sep10-12 05:46 AM
alitas
7 1,470
Okay I need to rotate a parabola on a cartesian coordinate system, y=x^2 by 90 degrees about the origin (either...
Sep10-12 03:09 PM
mesa
4 994
Apparently one can deduce the form of divergence in polar (and spherical) coördinates using the theorem of Gauss and...
Sep10-12 04:40 PM
dolphus
1 1,911
Just stumbled upon something and I've never been taught it before and cannot see why its true... Hoping someone can...
Sep10-12 09:47 PM
Mentallic
4 795
My probability class has me wondering about pure math questions now. We started with the axioms and are slowly...
Sep10-12 11:58 PM
chiro
4 1,063
How do you define a right handed coordinate system for a basis which is not orthonormal?
Sep11-12 12:00 AM
chiro
5 815
Hi, I've been studying uncertainty in measurement. I'm not sure how to decide if the uncertainty of a given...
Sep11-12 12:04 AM
chiro
1 871
The question was given: x(t) = (sin2t + sin3t)/2*sint determine the period. So I converted numerator and...
Sep11-12 11:23 AM
toneboy1
18 2,433
How would one solve the following WITHOUT a calculator? Sub in t as x^{\frac{1}{2}} 4x+8=33x^{\frac{1}{2}} I...
Sep11-12 12:39 PM
Mark44
9 1,779
On a math test, one of the questions was to solve -\sqrt{7-x}=-\frac{x^2}{2}+12x-10. I solved graphically with a...
Sep11-12 07:43 PM
uart
6 1,767
How do I solve this? :eek:
Sep12-12 03:12 AM
Sulfur
4 970
I have a problem taking the log of this expression \prod_{i=1}^m Now I would get \ln({\frac{1}{\sqrt{2\pi...
Sep13-12 12:09 PM
Polymath89
3 851
Hi all, I have a seemingly simple problem which is I'd like to efficiently evaluate the following sums: Y_k =...
Sep13-12 06:56 PM
AlephZero
1 792
Hi :-) I have questions regarding the binary properties of numbers. I would like to discuss some very specific...
Sep14-12 11:12 AM
HermyTheCrab
33 3,440
If you notice that there is symmetry in the numbers 0 to 10 this is a good place to start with what I want to talk...
Sep14-12 12:00 PM
micromass
22 1,969
Folks, I am struggling to see what is happening here particularly when ## \displaystyle \sum_{i=1}^{n-1}##...
Sep14-12 01:09 PM
bugatti79
2 1,118
I have figured out the answer to the question, but I have no idea why and how it works. I have attached a copy of...
Sep15-12 12:23 PM
Taylor_1989
2 803
Hi all, I have a general question about relative error. Suppose that we have a vector of measurements...
Sep16-12 04:49 PM
andresc889
0 1,255
Simplify the following expression. (2+1×2)−4×6 =(2+2)−4×6 =4−4×6 =4−24 =−20
Sep16-12 11:38 PM
Iccanui
8 1,394
I would just like someone to check maths for this venn diagram, just to make sure I have done the calculations...
Sep17-12 07:55 AM
Taylor_1989
3 910
Suppose I have a function f defined on x, f(x) = (x^2)/x and another function g defined on x, g(x) = x. Are both these...
Sep17-12 05:01 PM
dextercioby
2 836
Can I do operations like {\aleph_0}^{\aleph_0}mod {\aleph_0} and would this equal \aleph_0
Sep18-12 12:43 AM
chiro
1 524
Hi everybody; I am a bit stuck with negative angles. What I know is that: If we measure an angle from x-axis...
Sep18-12 01:36 AM
Zalajbeg
7 2,425
Is it okay to mix the types of brackets you use when writing out a solution to help make it a bit clearer? For...
Sep18-12 02:37 AM
NascentOxygen
12 1,051
I know that e^{rx} is an infinitely differentiable function. However, say you have f= x. this is clearly one time...
Sep18-12 03:04 AM
damabo
4 837
Hi guys, I'm trying to sort out the following formula, but just can't find out how to solve for 'x'. Could you...
Sep18-12 07:27 AM
HallsofIvy
9 1,106

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