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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.
Aug31-14 03:38 AM Yashbhatt 
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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
1 39,013
i'm going an analysis for work, but at stuck at this point. it's been a while since i took math or really used it to...
Oct26-07 09:36 AM
5 1,261
I cant seem to figure out how to simplify this!!!! n(n+1)/2 + n+1 which they were able to get (n+1)(n+2)/2 by...
Oct25-07 03:13 PM
4 858
Hi All: If given a set of 3D points data, it's very easy to calculate the covariance matrix and get the principle...
Oct25-07 11:52 AM
Chris Hillman
1 1,615
I ran into a trivial exercise. If a function f is bijective, show that it has an inverse. That's easy. But then, the...
Oct25-07 11:19 AM
5 11,330
what's the polynomial equation which sqrt2 + sqrt3 satisfies ?
Oct25-07 07:40 AM
Gib Z
10 2,496
If a space is of n dimension, then the boundary of this space is n-1 dimension or not?
Oct24-07 05:31 PM
matt grime
6 1,585
I tried at "Intro physics" and was warn that my post might be deleted if not stuck to a certain template. So, here I...
Oct24-07 05:09 AM
6 6,400
so i'm doing these lagrangian multipliers in calc class and it involves nonlinear systems and apparently the...
Oct23-07 09:03 PM
2 1,744
I have a complicated integral which i need to compute numerically. I can do this in C++ using a version of Simpson's...
Oct23-07 03:49 PM
3 4,869
Hi, what do you think that is actually the best method to solve the salesman problem ? does someone think about...
Oct23-07 02:57 PM
0 917
hello having a set of points of a curve, how i can find the best quadratic bezier curve that fits this curve? (so we...
Oct23-07 02:42 PM
4 15,553
I'm having some trouble understanding how to solve for i. This is the formula for compounding intrest. I'm reading...
Oct23-07 08:31 AM
3 9,619
I have 2 vectors with their x, y and z components. How do I evaluate A dot B? I know it is the product of their...
Oct22-07 05:44 PM
3 2,626
When looking at w^z = e^(z log w) I understand that adding any integer multiple of (2*pi*i) to log w is...
Oct22-07 05:29 PM
2 1,954
max x1x2 s.t. x1>=0, x2>=0, cx1+x2<=1 for some c, x1<=1/2. We know from the maximand that x1 and x2 cannot be 0....
Oct22-07 04:20 PM
0 1,331
There is a base-quadrilateraled pyramid ABCDS , which base is quadrilateral ABCD. Inscribed sphere is tangent in point...
Oct22-07 07:04 AM
3 1,766
If point P(m,2m) is 5 units from the line 12x+5y=1, m could equal a. 43/11 b.-3 c.-65/22 d.5 e.3 The answer is...
Oct22-07 02:25 AM
4 3,531
Hi! I would like to fit my data to a certain function that requires averaging over a distribution, say, lognormal or...
Oct21-07 10:59 PM
0 971
Hello all I am nearing my graduation (physics) and consider myself fluent in general English. Although I had to dig...
Oct21-07 01:04 PM
14 15,648
can anyone help me understand the following and how to apply them: tig identities sum and diff. indentities...
Oct21-07 08:35 AM
3 3,197
I was just browsing through my textbook in the section on hyperbolic trig functions. It defines sinhx to be...
Oct21-07 12:21 AM
14 2,908
Many abstract mathematical concepts have their intuitive correspondences or geometrical meanings. such as...
Oct20-07 07:27 AM
5 1,918
great video on how turning a sphere inside out ...
Oct20-07 06:56 AM
7 1,781
I was futzing around with some equations and i came across 2 problems that I'm having trouble solving. In the first...
Oct19-07 06:02 PM
38 9,521
I have a question as to why a particular space does not have a countable base. The space is the infinite Cartesian...
Oct18-07 03:27 PM
7 1,895
I heard that Archimedes proved geometrically that the area under the curve of x^2 is equal to x^3/3. I was just...
Oct18-07 02:31 PM
3 2,260
Hey, I came across this recurrence relation and was wondering if there was a closed-form solution for it. a_n =...
Oct18-07 08:58 AM
11 4,789
This has probably already been brought up at some point, but does anyone else think it is strange how much pi, the...
Oct18-07 07:08 AM
Gib Z
34 4,925
5 players each have a deck of 52 cards. Each pick one cards from the deck. a) what is the probability that exactly 2...
Oct17-07 06:46 PM
0 745
I am not a math student but I have read some basic stuff about topology just because it sounded interesting, and I was...
Oct17-07 06:10 PM
2 6,499
ok this is my problem... i have diagonalized the A matrix with the equation P^-1*A*P and the result is J=. in order...
Oct17-07 02:02 PM
1 1,585
if we consider a segment of course it's composed by infinitive points i want to contract it and i know the avarage...
Oct17-07 07:27 AM
4 1,539
Given a wine glass with angle theta, height h, what diameter ball, when placed in the wine glass will displace the...
Oct16-07 11:31 PM
24 4,255
I'm hoping someone could help me on this homework problem. I look in the book but it doesn't have anything like this...
Oct16-07 10:02 AM
2 1,306
What is exactly the difference between f and f(n) and why can't we write (f \circ g)(n) as f(n) \circ g(n)?
Oct15-07 09:24 AM
3 1,292
Hello all, sorry if this is a trivial question, or if it's been asked before, but I'm not good with math terminology...
Oct15-07 08:58 AM
3 6,106
Oct14-07 08:59 PM
Count Iblis
0 1,386
hi, ive recently started looking into maths outside of class and am mostly interested in proof. however, when...
Oct14-07 04:34 PM
7 1,199
6.0221367 is a number rounded to 8 significant figures. In a question, I am asked which of these shows correct...
Oct14-07 04:06 PM
4 1,737
Hi, I have a question regarding appropriate methods of finding volumes bound by geometric solids. I can work...
Oct14-07 03:28 PM
1 2,577

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