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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 38,810
In a right-handed cartesian coordinate system the divergence and curl operators are respectively: \nabla \cdot A=...
Oct19-11 04:13 AM
Aidyan
0 799
I'm confused by this problem. Is the answer 1 or 0 OR 1/2? If the series is upto n, then the answer is 1 if the number...
Oct19-11 03:24 AM
pwsnafu
28 3,624
Hey all..so Ill go ahead and say that I recently discovered passion for math..I didnt really learn too much in...
Oct19-11 03:00 AM
JJacquelin
1 732
Hey guys, I saw these just showed up on arXiv, published by some unknown who claims to have invented his own number...
Oct19-11 02:17 AM
chiro
5 2,276
http://imageshack.us/photo/my-images/809/equationu.png/ I'm not understand this simple step. Btw, this...
Oct19-11 12:21 AM
Char. Limit
1 601
How do you go about solving implicit equations for y in terms of x that look like these? y2 + yx = 1 and y3 +...
Oct18-11 10:05 PM
Mentallic
3 1,270
I have a hexadecimal number: 0x83 I need to determine 0x83^11 mod 15. Where the 11 and 15 are decimal. I...
Oct18-11 04:59 PM
obafgkmrns
1 1,266
Hi, First of all, sorry if this kind of thread has been posted before. If so, then a reference to that thread would...
Oct18-11 12:33 PM
ufarad
7 1,446
f(x)=xabs(x) show f '(0) exists
Oct18-11 09:00 AM
daveb
1 874
in a non mathematical sense? My maths isn't very good which is why I need some simple explanation of what they...
Oct18-11 08:25 AM
paulfr
6 3,025
I have a formula to be solved for x that is y=x^3-x I have a solution given x=((27y^2-4)^.5/23^2/3+y/2)^1/3 +...
Oct17-11 09:19 PM
Matt Benesi
2 950
This theorem I understand but I was only stuck in a simple implication in the proof Theorem : If f is continuous...
Oct17-11 04:51 PM
mahmoud2011
13 1,593
/cos^2β is maximum then what is the relation between θ and β.please explain the procedure.
Oct17-11 11:34 AM
anigeo
0 849
Hi, In school (I think) I recall there being a test for an equation which determined whether or not it was a valid...
Oct17-11 05:50 AM
Chrisistaken
4 1,324
this comes strait from a text book: http://higheredbcs.wiley.com/legacy/college/nise/0471794759/appendices/app_i.pdf...
Oct17-11 05:37 AM
AlephZero
1 890
Hi all, I am confused with this formula from the cross entropy method ...
Oct17-11 04:51 AM
TheMarksman
0 719
Heres two problems from an A Level related paper: prove that if pq is irrational then atleast one of p or q is...
Oct17-11 04:20 AM
logics
4 2,860
Hey, I'm trying to prove a larger theorem; in order to complete my proof I need to use the following lemma (or, if...
Oct16-11 09:21 PM
Deveno
14 1,803
Where's the motivation for concluding that there are infinitely many unique infinite cardinal numbers? I understand...
Oct16-11 12:41 PM
Number Nine
1 956
sin of an angle θ is sinθ=p/h. again sin90=1 which means that p=h.but the hypotenuse is the longest side of a right...
Oct15-11 11:03 PM
DaveC426913
1 1,281
http://anythinghere.comeze.com/slope.png The slope is supposed to be 0.16 but that's not what i get. Can someone...
Oct15-11 09:16 PM
bangthatdrum
2 1,019
So far I've been working elementary math problems where the main focus is on creative ideas. I want to up my game but...
Oct15-11 07:15 PM
bangthatdrum
5 1,308
Hello, I'm pondering over this research question. Let's suppose you've got a bunch of units which can be...
Oct15-11 05:36 PM
phinds
3 774
Aaaagh. I'm really confused right now. I just started learning MPG a few hours ago so go easy on me. It's hard to...
Oct15-11 12:21 PM
Quietus
0 1,243
Consider a cyclic quadrilateral ABCD with AD produced to E. Then \angleEDC = \angleABC (ext\angle=opp int \angle)....
Oct15-11 11:57 AM
grzz
0 1,791
Hi, I wolud like to solve the folowing equation: A*cos(B*t)+sin(B*t)*(C-t)-D=0 (t is unknown) It is urgent....
Oct15-11 12:52 AM
paulfr
5 1,185
How to prove (2n)!!=2^nn! for example (2)!!=2^11!=2 (4)!!=2^22!=8
Oct14-11 04:24 PM
matematikuvol
5 1,257
What is the greatest number N of equivalent masses M which can mutually gravitate over time within a radius R?
Oct14-11 02:41 PM
Loren Booda
2 767
Hi all, I am new to this forum. I am requesting all, please if you can help me. I want to integrate the Swallowtail...
Oct13-11 10:38 PM
zhouyang
6 1,290
Is this series divergent and what is its name? If the series is not divergent, what is the constant named? Note that...
Oct13-11 06:33 PM
Matt Benesi
2 872
Hello, Can someone tell me if what I am doing is correct. I am trying to solve this equation of 0 = n ( p - p0 )...
Oct13-11 06:14 PM
mathman
3 1,682
f(x)= lnx ; g(x) = ex f{g(x)} = ln ex = x; not an issue g{f(x)}= eln x = ???? (answer for this) f(x) and g(x)...
Oct13-11 05:39 PM
paulfr
7 1,404
How many minutes do you get for $100 if the cellphone plan charges .20 a minute? I think it's 500 minutes but I'm...
Oct13-11 05:13 PM
Embison
11 1,326
How do you compute a circular permutation with repetition? I need some literature on this, so if you can share any...
Oct13-11 04:54 PM
kaleidoscope
0 1,355
Hi all, \sum_{i=1}^n k_i \Pi_{i=1}^n O_i(\mu) How to interpret this equation.
Oct13-11 08:25 AM
TheMarksman
2 1,376
I began thinking of this question long ago, but only now, that I am reading A History of Mathematics, 2nd edition,...
Oct13-11 02:27 AM
Hootenanny
64 3,636
Show that, with an appropriate choice of constant c, the taylor series of (1+cx)ln(1+x) has terms which decay...
Oct12-11 07:51 PM
phinds
4 951
http://img442.imageshack.us/img442/4514/ballsp.jpg The base case is 2^{K} = n (which turns into log_{2}n = k So I...
Oct12-11 11:22 AM
seansrk
2 894
http://en.wikipedia.org/wiki/Square-integrable_function According to the tutorial: it says g*(x) is the complex...
Oct12-11 09:55 AM
HallsofIvy
2 900
Hi all, I have this kind of optimization problem: Variable to control: A=A= objective function to minimize:...
Oct12-11 07:51 AM
serbring
1 1,023

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