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

Feb2313 09:25 AM
micromass

1 
28,513 
hi there,
I am trying to prove the following inequality:
let z\in \mathbb{D} then
\left \frac{z}{\lambda}...

T 04:08 PM
mathman

1 
63 
I know this post is in the topology thread of this forum, for group theory, this seemed like the reasonable choice to...

T 02:56 PM
mathacka

0 
65 
Say we have two functions with the following properties:
f(x) is negative and monotonically approaches zero as x...

T 10:59 AM
ekkilop

2 
95 
Hi all,
Please help! I am reading the paper "A note on contiguity and Hellinger distance" by J. Oosterhoff and W.R....

T 12:13 AM
victoriaabc

2 
99 
Hi all, I am trying to construct a continuous matrixvalued function h=h(f,g) ; f,g in C^1,all defined in an open...

Aug1414 10:35 PM
WWGD

4 
464 
Recently I came across this information:
\text{S1} = 1+1+1+1+\dotsb= \frac{1}{2}
\text{S2} = 11+11+\dotsb=...

Aug1314 03:32 PM
mathman

1 
136 
We know that the derivative of the general Schwartz  Christoffel map (function) is:
f'(z) = λ(z ...

Aug1314 11:19 AM
D_Tr

2 
1,278 
Hello. I'm wondering if anyone has a table of transforms showing the result of an Abel transform on a Gaussian...

Aug1114 10:45 AM
Mr Boom

1 
186 
Just as we have orthogonal vectors/vector spaces/etc., we can have orthogonal functions/function spaces/etc. I'm...

Aug1014 09:45 PM
16universes

17 
348 
The Problem
Let x and y be real numbers such that y<x, using the Dedekind cut construction of reals prove that...

Aug914 06:40 PM
loops496

5 
238 
I'm trying to understand Čech cohomology and for this I'm looking at the example of ##S^1## defined as ##/\sim## with...

Aug714 12:05 AM
mathwonk

2 
1,489 
I am trying to reconcile the following statement:
" u<=eps*f means u=O(eps) ("u is order eps")... "...

Aug414 11:58 PM
Simon Bridge

7 
219 
Consider the sets ##X:= \{x\in\mathbb R^2: \enspace x(1,0)_2 \leq 1\}## (a ball) and ##Y:=co\{(0,1), (0,1),...

Aug414 10:34 PM
economicsnerd

2 
123 
Are plane and surface of sphere different metric spaces?
Can distance function of plane be applied as distance...

Aug214 09:00 PM
gianeshwar

6 
268 
I'm interested in topology/differential geometry and before I eventually graduate I am looking to complete an...

Aug214 06:50 PM
Matterwave

5 
222 
Just as the title says, what is a POD? I've tried reading papers but I feel I am missing something. Does anyone have a...

Jul2814 01:16 PM
joshmccraney

5 
1,259 
I am trying to show that for f in C , and ##n=0,1,2,... ## we have:
## \int_0^1 x^n f(x)dx =0 ## (&&) , then...

Jul1914 03:26 AM
WWGD

4 
610 
Hi All,
This is a followup to another post. Question is:
Is the restriction of an isotopy that is the identity...

Jul1914 03:23 AM
WWGD

6 
757 
Hi all,
Isn't the mapping class group of a contractible space trivial (or, if we consider isotopy, {+/Id})?
...

Jul1514 08:30 PM
homeomorphic

11 
2,231 
I've been reading Thomas Jordan's Linear Operators for Quantum Mechanics, and I am stalled out at the bottom of page...

Jul1314 04:05 PM
micromass

2 
1,351 
I was suprised to realize that foliation theory was actually closely related to topology. Indeed,...

Jul1214 08:28 PM
xaos

2 
1,875 
Suppose, for a suitable class of realvalued test functions T(\mathbb{R}^n), that \{G_x\} is a oneparameter family of...

Jul1014 04:32 PM
Greg Bernhardt

1 
2,566 
How to calculate
##\int^{\infty}_{\infty}\frac{\delta(xx')}{xx'}dx'##
What is a value of this integral? In some...

Jul614 04:49 PM
pwsnafu

14 
4,554 
I don't have the whole book A First Course in Sobolev Spaces by G. Leoni myself, but I have obtained a pdf file of the...

Jul614 12:00 AM
jostpuur

3 
1,364 
Visualizing a higherdimensional sphere seems impossible to me. The best that can be done is to come up with several...

Jul314 09:17 AM
Hornbein

2 
3,440 
Hello!
My problem consists of :
there is a representation of an uneven surface in terms of Fourier series with...

Jul214 03:33 PM
mathman

2 
2,006 
This question is in this rubric because I figured it belonged to measure theory, but I am ready to move it if I am...

Jul214 11:13 AM
nomadreid

2 
1,693 
Suppose we are given two functions:
f:\mathbb R \times \mathbb C \rightarrow\mathbb C
g:\mathbb R \times \mathbb C...

Jun1314 04:38 PM
mathman

1 
1,620 
Hi all,
Could you please help me understand the Fresnel integral and Green's functions? Could you please explain...

Jun1314 06:15 AM
159753x

2 
1,434 
series expansion: ln(1+x)=1x^2/2+x^3/3x^4/4+x^5/5+..........................∞
...

Jun1214 12:17 PM
statdad

12 
1,735 
Hello everyone,i am doing my project in image processing....
i have done video sementation using the Fourier...

Jun1114 05:42 AM
ramdas

2 
1,557 
Could anybody explain what divisors and the RiemannRoch theorem are intuitively, motivating them, without any jargon...

Jun1014 12:31 AM
mathwonk

3 
1,502 
Assumptions: f:\to\mathbb{R} is some measurable function, and M is some constant. We assume that the function has the...

Jun814 04:27 PM
WWGD

10 
2,400 
I want to show that the modulus of the automorphism
\frac{az}{1\overline{a}z}
is strictly bounded by 1 in the...

Jun514 05:20 PM
Likemath2014

2 
1,415 
hey pf!
physically, what does a fourier transform do? physically what comes out if i put velocity in?
thanks!
...

Jun514 12:36 AM
Simon Bridge

18 
3,474 
Hello
One problem I often think I have is that I am able to solve a problem, but not really understanding the idea...

Jun414 01:57 PM
bobby2k

4 
1,706 
Is it possible for a ball(with nonzero radius) to be empty in an arbitrary metric space?

Jun214 12:39 PM
xiavatar

1 
1,493 
Is it possible to perform a Fourier transform on a shape instead of a rectangular region? To be specific I am...

May3014 04:49 AM
tanus5

1 
1,477 
Can someone tell me if the continuous fourier transform of a continuous (and vanishing fast enough ) function is also...

May2814 02:29 AM
DeltaČ

4 
1,548 
Can anybody helps in suggesting books on Fourier transforms and applications. I have seen many applications of Fourier...

May2614 07:48 PM
dxy

8 
1,870 