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

Feb2313 09:24 AM
micromass

1 
46,270 
I understand that if you have a system that is linear and time invariant, that you can perform a Fourier transform on...

Nov2112 07:34 PM
thegreenlaser

10 
2,941 
Hello,
This limit
\lim_{x \to 0} \frac{ \sin x}{x}
is often cited as being an example where L'Hopital's rule...

Dec912 10:56 AM
lavinia

8 
1,684 
Hi Guys~
I was wondering if anyone had any suggestions for applications of the KelvinStokes Theorem. Recall that...

Nov2112 10:18 PM
lugita15

1 
1,085 
How we get relation
\lim_{t\to 0}f(t)=\lim_{p\to \infty}pF(p)?
Where ##\mathcal{L}\{f\}=F##.

Nov2312 02:05 AM
matematikuvol

4 
1,067 
I don't have a ton of experience in numerical methods, so I'm hoping someone can help me out. Suppose I have a...

Nov2512 08:21 PM
Stephen Tashi

6 
1,199 
\Gamma(n) = int(0 to infinity)dx
Show that it can also be written as:
\Gamma(n) = 2int(0 to infinity)dx
I...

Nov2112 05:18 PM
Zatman

2 
786 
Suppose I have a function of x and t such that
f(x,t) \leq x^{1/2} \sqrt{1+t^2}.
How should I express this...

Nov2212 04:41 PM
mfb

1 
769 
Hi,
I have a question concerning solid of revolution.
The bowlshaped volume formed by rotating the area...

Nov2412 08:05 AM
peripatein

4 
684 
Hi
I often see the following in books but I do not understand how they are equal. So can someone please tell me for...

Nov2312 01:00 PM
skiller

7 
1,449 
Could someone please explain how the formula at the bottom of the page is derived i.e. how is the Taylor theorem used...

Nov2412 07:48 AM
arildno

9 
1,364 
My textbook states
J_v(x) J'_{v}(x)  J'_v(x) J_{v}(x) = \frac{2 \sin v \pi}{\pi x}
My textbook derives...

Dec312 08:47 PM
mjordan2nd

4 
2,365 
It's not hard to show that the function:
g = \frac{1}{2} (c \times r)
is a "vector potential" function for the...

Nov2412 01:12 PM
thegreenlaser

3 
909 
Are these assertions true?
I am referring to polynomials with real coefficients.
1. There exists of polynomial of...

Nov2512 09:34 AM
Robert1986

6 
1,319 
http://imgur.com/SnHyP
What are the mathematical steps and assumptions to reach the conclusion that length(ab) ≈ dx...

Nov2412 10:43 PM
arildno

1 
753 
Reading through Spivak's Calculus on Manifolds and some basic books in Analysis I notice that the divergence theorem...

Nov2812 09:54 PM
mathwonk

5 
1,271 
Hello:
I have been trying to solve the following equation on MathCad or Excel, however its been quite a struggle :(...

Nov2612 06:53 AM
paula1980

7 
949 
So I've been practicing several series that can be solved using the alternating series test, but I've came to a...

Nov3012 07:19 AM
HallsofIvy

4 
1,150 
In many of my physics classes we have been using Taylor Expansions, and sometimes I get a bit confused. For example,...

Nov2812 10:44 PM
lurflurf

3 
878 
After doing my homework on testing for convergence/divergence in infinite series, I noticed that if you are testing...

Dec112 10:22 AM
Klungo

4 
858 
Is there any way to solve Fredholm integral equation without using Fourier transform....

Nov3012 03:40 PM
mathman

1 
688 
Hi y'all.
Here is exactly what is stated on the theory page of my book:
Example: Area of a Region
The area of a...

Dec312 09:01 PM
Kushwoho44

2 
841 
I'm having a conceptual problem with integrating a function and thought someone might enlighten me.
Say you have a...

Dec212 03:23 AM
DiracPool

5 
888 
hello,
Please see attached excerpt of a solution to a problem. I do not understand why the result obtained is to...

Dec312 01:18 PM
zn5252

4 
829 
I've been working my way through Intro to Electrodynamics (Griffiths), and in Chapter 3, one of the derivations comes...

Dec212 06:18 PM
Gibby_Canes

4 
879 
i facing a maths problem in integrating ∫ cos^2(∏/2cosθ) with limit from 0 to ∏/2,i was panic and struggled a long...

Dec312 04:32 PM
Mute

8 
1,204 
Hello there,
I have the function
$$f(t) = \int_0 ^{t} \frac{1}{\sqrt{t\tau}} \mathrm{d}\tau$$
The integral...

Dec412 01:53 PM
lavinia

3 
852 
As the title obviously states, how can I evaluate this integral by hand ? I know the result of it, I need to learn how...

Dec612 02:13 PM
swle

8 
1,106 
If i have a point at (0,0,5) in x,y,z system, then i make 2 rotation on the point with center at origin.
i)the first...

Dec712 01:37 AM
hei

6 
1,364 
Is it possible to do integrals like this with eulers formula
\int e^{x^2}cos(x^2)
and this integral is over...

Dec512 07:42 AM
lurflurf

1 
477 
guys,
we know ∇q=qi,j and ∇ ∇.q=qi,ij
but what will happen if we have qi,jqm,mj ? (sum on j)
I know...

Dec512 03:18 PM
Romik

0 
737 
hi,
Reading a book on thermodynamics and the guy often uses something like this :
∫1/T dQ = ΔS
and then he...

Dec712 05:37 PM
tinytim

7 
870 
When I attempt to use the method of integration by parts on the below integral, I don't get anywhere since I only...

Dec612 07:10 PM
Mark44

6 
861 
Today we learnt tabular integration as a shortcut method for integration by parts. Is there a proof that legitimizes...

Dec612 06:04 PM
Vorde

1 
1,192 
I have a question to ask, is dx = δx, can they cancel each other like \frac{dx}{δx}=1
and is it mean that:
...

Dec712 04:29 PM
destroyer130

5 
1,230 
I was trying to do 2d Fourier transform of 1/k^2 in 2d. I know that answer is log r. I am not able to derive it.
...

Dec612 11:22 PM
navaneethjnc

0 
737 
I have got this integration:
\int_{1}^{1}\frac{x^n}{(1+w^2P^22wx+p^2x^2)^2}dx
And at the same time, I can provide...

Dec712 01:28 AM
Wu Xiaobin

0 
529 
Recently I have been working on classical Gaussian electrical field and I come through this joint
moments...

Dec712 01:58 AM
Wu Xiaobin

0 
770 
I need to take the integral of the following function over one cycle.
y(t) = sin(wt)cos(wtp)
p is a phase...

Dec712 03:11 PM
mathman

1 
650 
Why Poisson kernel is significant in mathematics? Poisson kernel is ##P_r(\theta)=\frac{1r^2}{12rcos\theta+r^2}##....

Dec712 12:44 PM
matematikuvol

2 
619 
I've been wanting to learn physics for a while, and bought an intro book and read through it. Now I want to move onto...

Dec812 03:39 PM
Thetes

2 
753 