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

Feb2313 09:25 AM
micromass

1 
28,119 
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 
980 
We know that the derivative of the general Schwartz  Christoffel map (function) is:
f'(z) = λ(z ...

Jul2014 10:09 AM
D_Tr

0 
984 
I'm trying to understand Čech cohomology and for this I'm looking at the example of ##S^1## defined as ##/\sim## with...

Jul1914 08:06 AM
Geometry_dude

1 
1,208 
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 
480 
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 
618 
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 
2,015 
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 
1,215 
I was suprised to realize that foliation theory was actually closely related to topology. Indeed,...

Jul1214 08:28 PM
xaos

2 
1,706 
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 
2,395 
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 
4,244 
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 
1,212 
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 
3,208 
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 
1,820 
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 
1,530 
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 
1,459 
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 
1,296 
series expansion: ln(1+x)=1x^2/2+x^3/3x^4/4+x^5/5+..........................∞
...

Jun1214 12:17 PM
statdad

12 
1,587 
Hello everyone,i am doing my project in image processing....
i have done video sementation using the Fourier...

Jun1114 05:42 AM
ramdas

2 
1,409 
Could anybody explain what divisors and the RiemannRoch theorem are intuitively, motivating them, without any jargon...

Jun1014 12:31 AM
mathwonk

3 
1,369 
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 
2,226 
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 
1,268 
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 
3,163 
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 
1,544 
Is it possible for a ball(with nonzero radius) to be empty in an arbitrary metric space?

Jun214 12:39 PM
xiavatar

1 
1,339 
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 
1,340 
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 
1,394 
Can anybody helps in suggesting books on Fourier transforms and applications. I have seen many applications of Fourier...

May2614 07:48 PM
dxy

8 
1,705 
Hi, this issue came up in another site:
We want to compute ( not just ) the deRham cohomology of ## X=\mathbb...

May2314 01:15 PM
WWGD

4 
1,375 
The intuitive picture I have of giving a set a topology, is that of giving it a shape in the sense of connecting the...

May2014 06:35 PM
WWGD

7 
1,511 
Hi, Let V be a fin. dim. vector space over Reals or Complexes and let L: V>V be a linear operator.
I am just...

May1814 01:53 PM
homeomorphic

1 
1,325 
Why is preferable to use the line integral than the area integral over the complex plane?

May1714 08:19 PM
WWGD

2 
1,503 
Why is the characteristic function* of a ball in Rn continuous everywhere except on its surface?My lecturer said that...

May1014 08:06 AM
HallsofIvy

5 
1,802 
Define ##\rho(f)=\int f\mathrm d\mu## for all integrable ##f:X\to\mathbb C##. This ##\rho## is a seminorm, not a...

May814 03:08 PM
Fredrik

21 
3,520 
Hi all, I was reviewing some old material on the representation of orientable surfaces
in terms of disks and bands , ...

May414 10:35 PM
WWGD

2 
1,516 
I asked this in the logic&probability subforum, but I thought I'd try my luck here.
......
Let (A,\mathcal A),...

May414 10:21 PM
Greg Bernhardt

1 
1,491 
I've got a Green's function in which all the impulses are on the line from the north pole to the origin (polar angle...

May414 10:21 PM
Greg Bernhardt

1 
1,738 
I am reading James Munkres' book, Elements of Algebraic Topology.
Theorem 6.2 on page 35 concerns the homology...

Apr2814 09:19 PM
homeomorphic

12 
1,782 
Can a measurable function be a.e. equal to a nonmeasurable function?
Let ##(X,\Sigma,\mu)## be an arbitrary...

Apr2814 12:44 PM
micromass

13 
1,932 
Hi
How much different is complex analysis from vector calculus?
To me complex analysis looks like vector calculus...

Apr2714 02:43 PM
marmoset

19 
4,932 
I am reading James Munkres' book, Elements of Algebraic Topology.
Theorem 6.5 on page 39 concerns the homology...

Apr2414 07:28 PM
Math Amateur

4 
1,520 