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Common math questions, quality answers.
T 03:24 PM Greg Bernhardt 
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Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed. Brought to you by Office_Shredder.
Y 04:33 PM pasmith 
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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 36,937
I came across something from the higher classes of math and I tried to prove it: What do you call this kind of...
Jul9-07 04:43 PM
okunyg
8 1,795
Greetings, I'm curious if "magic squares" have been found to be useful in mathematical or scientific endeavors...
Jul9-07 07:45 AM
HallsofIvy
3 2,620
Greetings, I suppose all of us have at one time or another been fascinated by "magic squares" My question is: has...
Jul9-07 06:45 AM
Qaiser Raza
8 3,104
"The arrangement of numbers with n rows and n columns to be a true magic square is that it contains all the integers...
Jul9-07 06:38 AM
Qaiser Raza
9 2,607
Lets say i have two sets of numbers (dealing with real numbers only): \{ x \in R |x \ge 0\} \{ x \in R |3...
Jul8-07 10:19 PM
danago
3 3,033
can somebody prove that for all a,b,c>0: a/(b+c) + b/(a+c) + c/(a+b) >= 3/2
Jul8-07 05:00 PM
morphism
1 1,412
Hi I have some problems with really basic equations (really elementary) Let's say in order to solve an equation...
Jul8-07 02:44 AM
truewt
2 1,816
I think this belongs here, because it's not specifically differential geometry (well, that's an assumption, I don't...
Jul6-07 11:11 AM
Yersinia Pestis
0 1,030
I'm planning on taking a limits and infinite series course soon and was wondering what book(s) I could get off Amazon...
Jul6-07 08:40 AM
Edgardo
6 1,956
W*C^(Z/A) = X*C^(Y/A) - D*X + D*W How do you go about solving for A? Known: C>1 Also, if it makes it easier (it...
Jul6-07 08:34 AM
davee123
2 1,474
Back in the fractal craze, I wrote a simple application to generate the Mandelbrot set, and after way too many wasted...
Jul5-07 10:41 PM
ktoz
2 943
quick question: how does this work- (root)72 = 6(root)2 and what is this technique called?
Jul5-07 06:15 PM
Kurdt
2 944
a^(1/(2)^1/2)) that is a raised to the power 1/underroot(2)
Jul5-07 05:06 AM
HallsofIvy
2 1,267
Followup: Suppose we have 2^9 ways of choosing topics on a pizza. Then, if we want different topics on 3 pizzas, we...
Jul4-07 09:30 PM
sk381
2 917
Hi, I am interested in knowing what the names of the english math books are for the school you begin on when you are...
Jul4-07 05:21 PM
disregardthat
15 4,307
My friend says that : If there are 9 different toppings then the number of ways to choose toppings for one pizza is ...
Jul4-07 05:21 PM
Werg22
4 1,093
hi i'm confused at to how my textbook has done the following cancelling :S. hope you can clear things up for me :D...
Jul3-07 01:30 PM
Trail_Builder
2 1,188
cos(2x)=2cos^2(x)-1 what algebrical rule guarantees me thet is right to divide both angles for 2:...
Jul3-07 11:46 AM
uart
1 1,846
when there is enough block ... here is my problem. a hyperbola having F(-5,0) and D(5,0) and difference of focal...
Jul3-07 11:44 AM
threetheoreom
2 1,244
Newby here. Can someone summarize Godel's Theorems for me? I'm not very knowledgeable on such things, but would...
Jul2-07 05:06 PM
matt grime
8 1,758
Just want a check of this please: We have a complex equation of the form az+bz*+c=0 where a, b and z are complex...
Jul2-07 10:49 AM
loonychune
3 2,483
i just cant figure this out. given a n x n matrix (with n>1) "A" such that all entries are integers and A is...
Jul2-07 09:43 AM
Kummer
4 2,245
How important is it to you to understand the math your applying? I am decent at math when it comes to remembering...
Jul2-07 06:29 AM
morson
7 1,461
im so embarrased askin so much :blushing: show that given 5 distinct lattice points in the plane (points with...
Jul1-07 07:50 PM
Kummer
1 918
people discuss only distances between points but why not within a point itself ? i think a point also has a distance,...
Jul1-07 06:58 PM
HallsofIvy
13 1,356
stupid error in the "tex" thing, see first post.
Jul1-07 12:35 PM
Trail_Builder
7 1,362
During my freshman year at Yale, I took a course in multivariable calculus under the tutelage of Prof. Serge Lang. He...
Jul1-07 08:40 AM
mathwonk
14 4,949
lol if you have time for a 6minute video watch this homeless guy is talking about suposed non-linear algebra. I...
Jun30-07 10:26 PM
Hurkyl
20 4,251
What would be the practical effects if it is proved that P=NP and an efficient polynomial time algorithm is found for...
Jun29-07 06:25 PM
Reverie
9 1,538
Do you find that after doing a few hours of math it's harder than usual to follow conversations or form sentences?...
Jun29-07 07:57 AM
Gib Z
7 1,367
hey does anyone know if studying fourier analysis is going to aid in physics, particularly in string theory or quantum...
Jun29-07 01:51 AM
Reverie
3 1,208
I have a set of data points relating the width of an object in an image to its distance from the camera. I'd like to...
Jun28-07 03:46 PM
Feldoh
9 2,667
how are the secret codes for recharging the credit of a phone or the secret credit card numbers gnerated? i hrd...
Jun28-07 03:43 PM
Feldoh
3 1,448
Hi I am reading the book "Introduction to logic and the methodology of deductive sciences" and I'm doing my best on...
Jun28-07 03:52 AM
fopc
7 1,650
OK...a friend of mine sent me this brain teaser and I havent been able to crack it...I'm starting to think that maybe...
Jun27-07 10:21 PM
ice109
5 2,974
So I was having a conversation with the guy I share an office with and I brought up the gaussian distribution to show...
Jun27-07 09:12 PM
chroot
8 2,595
what are some for evaluating logs? square roots? trig functions? this makes me curious obviously i don't...
Jun26-07 08:12 AM
Gib Z
6 1,208
Hello. I have this page.I don't know from what book these questions are taken. If anyone knows please tell me the...
Jun25-07 03:50 AM
Aladin
2 1,877
http://arxiv.org/abs/0706.3342 The Forgotten Night: The Number Devil Explores Spherical Geometry Marissa L. Weichman...
Jun24-07 09:57 PM
mongoose
3 1,878
In my book and in other places, they give this rule to obtain the domain for a compound function: "the domain of (f...
Jun23-07 12:04 PM
Hurkyl
7 3,562

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