
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:23 AM
micromass

1 
39,006 
I was told that the limit of e^iwt as t> infinity is 1 or is at least modelled as 1. Can anyone tell me why this is?...

Oct2211 05:01 PM
schtruklyn

4 
8,088 
ans the question

Oct2211 10:11 AM
HallsofIvy

2 
630 
Hi,
I have a question regarding partial fractions. One of my Math lecturers said that to find partial fraction, we...

Oct2211 07:20 AM
HallsofIvy

1 
1,169 
I can not find any useful online tool that solves you a system of equations using Gaussian elimination and LU...

Oct2111 05:55 PM
XodoX

4 
3,503 
Hey all,
BACKGROUND: (please note that knowledge of this is not necessary):
I'm currently writing a javascript...

Oct2111 04:31 PM
zgozvrm

5 
1,721 
I am currently trying to solve for the metric function for a black hole in adS space with quasitopological gravity....

Oct2111 04:14 PM
mathman

1 
2,028 
I finished exploring a family of functions
fk(x) = {xksin(1/x) for x≠0
{0 ...

Oct2111 02:07 PM
SithsNGiggles

2 
782 
\int^{\pi}_{0} f(x) dx where ,
f(x) = sin x if 0 \leq x < \frac{\pi}{2}
and f(x) = cos(x) if...

Oct2111 10:46 AM
mahmoud2011

7 
1,568 
hello friends .
i need to your help please.i am a hight school student.and i want participat in the international...

Oct2111 01:10 AM
yasminemath

3 
800 
Does anybody know if there is any software available that is capable of recognizing patterns in a series of numbers...

Oct2111 01:00 AM
fenian

4 
3,344 
Sometimes I like to find patterns in certain functions, for example, repeated Sigma (Summation) notation.
But what if...

Oct2011 10:14 PM
bjshnog

4 
1,734 
What are they, how are they visualized? Is it like how basic equations when plotted form a shape (e.g. circle) but...

Oct2011 08:13 PM
Number Nine

5 
1,243 
Not sure if this is the right section to post this..
I have 3 measurements and was trying to take the average of the...

Oct2011 05:54 PM
davidp92

0 
569 
I have been trying to find out if this is possible and can't find anything, probably I'm not using the right maths...

Oct2011 01:25 PM
SidBala

1 
1,068 
Hi,
What is the following derivative:
\frac{\partial}{\partial x}bax^2?
Now I know that...

Oct2011 12:37 PM
lurflurf

6 
1,531 
Hello,
I have some difficulties of calculating the following two integrals:
I_{1}=\int _{D_{1}}\:\:\:d^{3}q\:...

Oct2011 08:08 AM
kassem84

0 
657 
Are physics laws (even the laws) mathematical models of reality? Or they describe reality as it is? Are those laws...

Oct1911 09:16 PM
lostcauses10x

14 
1,652 
Hi guys,
Please can someone look at this working (see attached).
The equation in question is . It is highlighted...

Oct1911 08:01 PM
Matt Benesi

3 
1,195 
Say I have a function (F) that takes an input (P) and returns an output (E). Suppose F isn't invertible so, knowing F...

Oct1911 04:52 PM
spamiam

1 
934 
I don't know why I thought in this way , I ask : if a and b are real numbers and c is also a real number , now if a=b...

Oct1911 02:11 PM
Citan Uzuki

9 
1,288 
Hi all
Suppose that , a_{n+1}=a_n^22 and g_n=\frac{a_1a_2...a_n}{a_{n+1}}.
Evaluate \lim_{n\rightarrow \infty }...

Oct1911 06:30 AM
jasonRF

1 
743 
In a righthanded cartesian coordinate system the divergence and curl operators are respectively:
\nabla \cdot A=...

Oct1911 04:13 AM
Aidyan

0 
803 
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...

Oct1911 03:24 AM
pwsnafu

28 
3,654 
Hey all..so Ill go ahead and say that I recently discovered passion for math..I didnt really learn too much in...

Oct1911 03:00 AM
JJacquelin

1 
734 
Hey guys,
I saw these just showed up on arXiv, published by some unknown who claims to have invented his own number...

Oct1911 02:17 AM
chiro

5 
2,281 
http://imageshack.us/photo/myimages/809/equationu.png/
I'm not understand this simple step.
Btw, this...

Oct1911 12:21 AM
Char. Limit

1 
603 
How do you go about solving implicit equations for y in terms of x that look like these?
y2 + yx = 1
and
y3 +...

Oct1811 10:05 PM
Mentallic

3 
1,274 
I have a hexadecimal number: 0x83
I need to determine 0x83^11 mod 15. Where the 11 and 15 are decimal.
I...

Oct1811 04:59 PM
obafgkmrns

1 
1,273 
Hi,
First of all, sorry if this kind of thread has been posted before. If so, then a reference to that thread would...

Oct1811 12:33 PM
ufarad

7 
1,461 
f(x)=xabs(x) show f '(0) exists

Oct1811 09:00 AM
daveb

1 
878 
in a non mathematical sense?
My maths isn't very good which is why I need some simple explanation of what they...

Oct1811 08:25 AM
paulfr

6 
3,078 
I have a formula to be solved for x that is y=x^3x
I have a solution given x=((27y^24)^.5/23^2/3+y/2)^1/3 +...

Oct1711 09:19 PM
Matt Benesi

2 
960 
This theorem I understand but I was only stuck in a simple implication in the proof
Theorem : If f is continuous...

Oct1711 04:51 PM
mahmoud2011

13 
1,612 
/cos^2β is maximum then what is the relation between θ and β.please explain the procedure.

Oct1711 11:34 AM
anigeo

0 
853 
Hi,
In school (I think) I recall there being a test for an equation which determined whether or not it was a valid...

Oct1711 05:50 AM
Chrisistaken

4 
1,335 
this comes strait from a text book:
http://higheredbcs.wiley.com/legacy/college/nise/0471794759/appendices/app_i.pdf...

Oct1711 05:37 AM
AlephZero

1 
897 
Hi all,
I am confused with this formula from the cross entropy method
...

Oct1711 04:51 AM
TheMarksman

0 
722 
Heres two problems from an A Level related paper: prove that if pq is irrational then atleast one of p or q is...

Oct1711 04:20 AM
logics

4 
2,884 
Hey,
I'm trying to prove a larger theorem; in order to complete my proof I need to use the following lemma (or, if...

Oct1611 09:21 PM
Deveno

14 
1,818 
Where's the motivation for concluding that there are infinitely many unique infinite cardinal numbers?
I understand...

Oct1611 12:41 PM
Number Nine

1 
967 