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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. Brought to you by Office_Shredder.
Jul31-14 12:54 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 38,257
Why the mathematician call identification topology "quotient topology"?from my viewpoint,identification topology bear...
Sep10-07 06:29 AM
navigator
3 1,430
(1) using stokes theorem and cutting the surface into 2 parts how can we prove that \int curl A.n dS = 0 ...
Sep10-07 06:25 AM
mathwonk
22 5,178
how could i expand something such as arctan'x into a power series. also how would you be able to find the power series...
Sep10-07 05:41 AM
HallsofIvy
7 28,107
I've been really stumped by this one from my math class. It's a two variable trig. question with two equations. I...
Sep9-07 04:30 PM
rocomath
7 1,407
I have tried this question (http://img524.imageshack.us/img524/9539/scan0001pa1.png) a number of times and always use...
Sep9-07 07:32 AM
HallsofIvy
10 2,226
hi can anyone tell me how could one go about to prove x* (delta)' ~ -delta where delta is the dirac delta...
Sep8-07 02:33 PM
Hurkyl
11 1,314
General Info. A Mathematician's Apology is a 1940 essay by British mathematician G. H. Hardy. It concerns the...
Sep8-07 07:05 AM
AlephZero
3 2,747
I'm looking for a particular (actually, there are probably several) of two numbers that are "extremely close...
Sep8-07 06:13 AM
Gib Z
13 1,809
Dear all valuable experts, I'm looking for a free based maths graph plotting software which could display a sketch...
Sep8-07 02:14 AM
rela
3 1,295
for example...is there some software that will let me do all my calculations mod 2 or something? free software would...
Sep7-07 06:25 PM
matt grime
3 1,169
There are SIN and SINH. The first one is familiar as SINUS on calculus (or trigonometry), but, I don’t know what SINH...
Sep7-07 02:16 PM
HallsofIvy
6 15,133
hey i know the basics about complex numbers like: 5*i^7 = 5*i^3 = 5 * -i = -5i = (- pi/2, 5) but now : how...
Sep7-07 02:09 PM
HallsofIvy
10 1,873
This is for a PnP RPG I am creating... I've looked around for places on the internet, but haven't really found...
Sep7-07 10:22 AM
CRGreathouse
18 2,432
hello commonly we have: \int^t_0 \ dx=M "M" is a specific number (the result of integal) my question: having...
Sep7-07 06:18 AM
HallsofIvy
4 2,278
I've found a new way for finding the circumference of a circle by using a visual perspective ,an angle of 18 degrees,...
Sep6-07 05:43 PM
phi-lin good
3 5,043
Ok so the problem: 2 trains are 100 miles apart traveling towards each other on the same track. Each train tavels...
Sep6-07 01:50 PM
JonF
8 9,087
I think I have returned all my math back to teachers without any refund. y=f(x); h=xb-xa, which is very small. ...
Sep6-07 01:48 PM
JonF
5 7,919
For the most recent post in PF, which is most likely: few or no replies, or many replies? Is there a distribution of...
Sep6-07 08:09 AM
cristo
2 1,246
Hello friends. If anybody of you are interested in my theory of planar angles and trimetry, you can see de enclosed...
Sep6-07 06:45 AM
ferman
0 1,572
Does anyone can solve the following equation x^2 – x < 0 Here is the solutions of mine: x^2 – x < 0 x(x – 1)...
Sep6-07 06:43 AM
HallsofIvy
2 1,354
I need samples of parametric equations: x=Fx(t); y=Fy(t); the samples must be useful or famous in math, physics...
Sep6-07 04:36 AM
xyz3003
2 1,340
I currently attend a community college. For several semesters I did poorly--failed one class and dropped out of a...
Sep5-07 11:06 PM
mathwonk
6 6,044
I am confused myself, so I post the Q. when we talk about "definite integral of area" in rectangular or polar...
Sep5-07 09:35 PM
xyz3003
0 2,856
Hello, was wondering if someone could help me with a little vector maths problem please. What I need to find is the...
Sep5-07 07:18 PM
ice109
3 2,718
Hi again everyone… I have 3 questions: 1) What is the difference between INVERSE and RECIPROCAL? 2) Does...
Sep5-07 11:48 AM
HallsofIvy
2 1,166
n = (28)^3 which is greater: the units digit of n OR 4?
Sep5-07 10:05 AM
uart
15 2,572
Disregard this, Sorry i posted a hw question by accident.
Sep4-07 08:02 PM
Lemm
0 1,281
I've been reading some books on theoretical physics lately, namely stuff by Michio Kaku. I am heading to college in...
Sep4-07 05:33 PM
Dragonfall
3 1,399
So I decided to buy the book The Elements because i couldn't pass the offer up(for $10, can you believe that?) and...
Sep3-07 03:17 PM
mathwonk
4 2,330
i dont understand the point of \hat{\theta} if a vector is completely described by \textbf{r}=r \hat{\textbf{r}} ...
Sep3-07 12:56 PM
ice109
4 4,106
Hello friends, I am studying in 10th class. Actually I have a question and I’m unable to solve this question. My...
Sep3-07 12:31 PM
ryan_276
3 1,023
I wanted to know , if x(n) has DTFT X(e^jw) then can we define Y(e^jw) in terms of X(e^jw)? where Y(e^jw)is DTFT...
Sep3-07 03:43 AM
ratn_kumbh
1 1,457
I understand that infinity - X = infinity. However, what I don't understand is this. If I have: infinity - 1 =...
Sep2-07 10:07 PM
Hurkyl
4 4,633
Another vent of frustration: I hereby nominate the three worst offences committed in maths textbooks as 0....
Sep2-07 08:31 PM
PowerIso
38 4,951
Hello everyone, I use a TI-83 Plus and I'd like to know if there is a quick way to convert an angle from radian to...
Sep2-07 06:10 AM
HallsofIvy
5 38,591
norm is defined to be the length of the vector and we put we denote it by ||a||. However, modulus |a| also means...
Aug31-07 11:19 AM
Chris Hillman
6 5,065
Does anyone can solve the following equation? |x − 1| = 1 − x Thanks Tom
Aug31-07 10:22 AM
cks
13 1,791
We know that anything divided by zero is 'undefined' or equal to infinity. Is it not possible to define in anyway such...
Aug31-07 10:01 AM
ron_jay
14 3,363
Hi all. I am learning a numerical method that involves Fourier transform. As far as I know, I think Fourier...
Aug31-07 01:42 AM
hanson
0 1,230
I am trying to remember the formulas and ways to do this but I am have much trouble! Please help! Thank you! 1) Find...
Aug31-07 01:14 AM
d_leet
7 2,008

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