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

Feb2313 09:25 AM
micromass

1 
24,702 
Hello!
I'm trying to teach myself some mathematics, and I want to see if I understand this concept correctly from...

T 05:36 AM
bolbteppa

3 
172 
I asked this in the logic&probability subforum, but I thought I'd try my luck here.
......
Let (A,\mathcal A),...

Apr1614 09:00 AM
economicsnerd

0 
86 
Mathematically what does it mean to take a "2D slice of a 6D CalabiYau manifold"?
Part of quote taken from the...

Apr1514 01:14 PM
Ben Niehoff

6 
242 
Let T: l^2 > l^2 be bounded linear operators. K=L(l^2,l^2) be the space of T, Prove that K=L(l^2,l^2) is not...

Apr1314 05:05 PM
micromass

2 
120 
I am reading munkres topolgy and I am struggling with understanding the following sentence:
"We say that a subset C...

Apr1314 11:16 AM
micromass

4 
202 
https://www.youtube.com/watch?v=pXQPI2oA8Fw
Around the 4 minute mark the lecturer makes this statement, but I am...

Apr914 07:47 PM
D H

9 
518 
If you take an ordered field of numbers with the operations of addition and multiplication, endowed with the...

Apr714 04:37 PM
Mark44

6 
332 
May i know to obtain fourier series representation for trigonometric and complex form base on magnitude spectrum and...

Apr514 03:01 PM
mathman

1 
209 
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...

Apr114 05:13 PM
SupernerdSven

0 
259 
The Cauchy's differintegral formula is: \frac{d^n}{dz^n}f(z_0)=\frac{n!}{2\pi...

Mar3114 04:23 PM
Jhenrique

2 
266 
If a holomorphic function is a function that \frac{\partial f}{\partial \bar{z}} =0
Thus, an antiholomorphic function...

Mar3014 03:05 PM
Jhenrique

2 
168 
In showing diam(cl(A)) ≤ diam(A), (cl(A)=closure of A) one method of proof* involves letting x,y be points in cl(A)...

Mar2914 08:00 PM
micromass

3 
247 
I am reading Martin Crossley's book, Essential Topology.
I am at present studying Example 5.55 regarding the Mobius...

Mar2814 09:16 AM
Mandelbroth

1 
232 
If a space X is arcwise connected, then for any two points p and q in X the fundamental groups ##\pi_1(X,p)## and...

Mar2714 10:22 PM
mathwonk

4 
397 
I am reading Martin Crossley's book, Essential Topology.
Example 5.43 on page 74 reads as follows:
...

Mar2114 04:12 PM
Mandelbroth

1 
306 
Example 1 in James Munkres' book, Topology (2nd Edition) reads as follows:
...

Mar2114 12:00 AM
Math Amateur

3 
283 
Hello,
given two functions f and g the operation of convolution f\ast g finds many applications in many different...

Mar2014 03:29 PM
mnb96

4 
289 
what the following statement exactly mean :"A topological space is a set M with a distinguished collection of...

Mar1914 08:53 AM
lee.spi

4 
253 
A fellow student of mine asked a question to our teacher in functional analysis, and the answer we got was not very...

Mar1714 11:54 AM
economicsnerd

13 
1,002 
The context is that I am reading the proof that Lebesgue measure is rotation invariant
Let X be a kdimensional...

Mar1514 06:43 AM
Shaji D R

12 
500 
Hi there,
Let S denote the shift operator on the Hardy space on the unit disc H^2, that is (Sf)(z)=zf(z).
My...

Mar1414 10:28 AM
micromass

3 
259 
Hi everyone, a couple of technical questions :
1) Definition: Anyone know the definition of the induced orientation...

Mar1414 04:41 AM
WWGD

1 
229 
I'm trying to get a better understanding of some topology for a GR class I'm taking...I'm wondering if someone can...

Mar1414 04:04 AM
WWGD

9 
358 
Calculating residues are useful when we are trying to solve some improper integral, because the Cauchy principal value...

Mar914 04:35 PM
lurflurf

5 
333 
Let α be a Dedekind Cut. w a positive rational.How to prove that there exists a integer n such that nw is a member of...

Mar914 04:27 AM
Shaji D R

1 
224 
I was taking a break from studying from my real analysis, electrodynamics, and nuclear physics exams this week, and,...

Mar814 01:08 PM
epr1990

8 
320 
Hello all,
I'm going through Foundations of Mathematical Analysis by Johnsonbaugh and Pfaffenberger, and I read a...

Mar714 06:18 PM
Stephen Tashi

1 
308 
Hello:
I am trying to find a functional derivative of the following functional:
v_{s}, v_{ext}(r)] = \int...

Mar414 09:42 AM
dikmikkel

0 
287 
It seems strange, but would a metric space consisting of two points, X={a,∞} be totally bounded, but not bounded?...

Mar414 07:12 AM
shortydeb

3 
325 
When considering tempered distributions, I am only aware of the definition of test functions of a real variable. ...

Mar114 07:27 AM
jasonRF

3 
374 
Hello,
I have seen (in H Cartan's differential calculus) a proof that if F is a Banch space, L(E,F) where E is some...

Feb2714 09:51 PM
mathwonk

4 
379 
I've seen a few references to it, but can't find it defined anywhere. What is it? Something with integrating distances...

Feb2614 04:14 PM
johnqwertyful

2 
323 
If the definition for holomorphic function is that it satisfies \frac{\partial f}{\partial \bar{z}}=0 so is correct to...

Feb2514 03:30 PM
Jhenrique

0 
262 
I understand that the Fourier transform maps one function onto another. So it is a mapping from one function space...

Feb2414 11:35 AM
Edgardo

6 
404 
I previously posted this related thread http://www.physicsforums.com/showthread.php?p=4663806&posted=1#post4663806
...

Feb2114 08:17 PM
FactChecker

8 
531 
I have recently been assigned a project in my undergraduate topology class. I would like to do something in physics...

Feb1914 07:26 PM
FactChecker

5 
452 
Please give me example of antipodal set in infinite dimensional?

Feb1914 01:28 PM
economicsnerd

1 
255 
Hi everyone,
the question is simple: is \mathcal{S}'\left(\mathbb{R}^3\right) a first countable topological space...

Feb1614 07:25 AM
dextercioby

6 
430 
In set theory a set is defined to be a collection of distinct objects (see...

Feb1314 08:22 PM
Number Nine

18 
1,159 
So when we have an open cover of a set X means we have a collection of sets \{ E_\alpha\}_{\alpha \in I}
such that...

Feb1214 03:47 PM
economicsnerd

3 
433 