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

Feb2313 09:25 AM
micromass

1 
31,091 
Hi everyone,
I have struggle to study fuzzy differential geometry for a while and have some difficulties on the...

Sep908 03:12 AM
saddy

0 
1,336 
Is the Picard group the same as the group all possible parallel transports on a manifold? If so, is it safe for me to...

Sep808 01:10 PM
Jim Kata

0 
1,259 
Hello all,
I am taking a class on differential geometry and I have run into a problem with the following question:...

Sep808 12:08 PM
whynothis

2 
1,349 
If I stretch an ellipse with .5 eccentricity along an axis 45 degrees from its major axis, doubling its area. How do I...

Sep808 08:31 AM
Keys

4 
6,747 
Hi...I'm new to the forum but I need help with the following question.
I need to find a topology on N for which...

Sep708 08:14 PM
gel

2 
1,760 
I am trying to show that if X is a topological space, ~ an equivalence relation on X and q:X>X/~ the quotient map...

Sep608 10:46 PM
jostpuur

19 
3,062 
The wikipedia article on Electromagnetic tensor has:
With the electromagnetic tensor, the equations for magnetism...

Sep508 04:01 PM
cristo

4 
4,662 
I have this question:
Inside a square ABDE, take a point C so that CDE is an isosceles triangle with angles 15...

Sep308 09:35 PM
chaotixmonjuish

2 
1,510 
Hi
Let's assume we have a, say, 10 cm * 20 cm, not very thick, rectangular object. We also have a huge ball, with a...

Sep208 03:14 AM
mgb_phys

1 
1,351 
Hi everyone,
i have a problem concerning with the reason to why taking the cycloid to be parametrised by (sin(t)t,...

Sep108 11:31 AM
tinytim

1 
1,883 
What is the metric or distance between two points in a hyperbolic space of dimension n?

Sep108 03:46 AM
tgt

0 
1,815 
P1: A curve defines a vector at point.
P2: A function defines a covector at a point.
F1a: A congruence of curves...

Aug3008 08:03 PM
atyy

9 
3,037 
If three points make a plane? what does four make 1 also until you reach 6 how does that system work?

Aug2808 07:07 PM
chroot

1 
5,483 
Popular math books usually explain topology as the study of spaces allowing strecthing and shrinking and some cutting...

Aug2808 04:17 PM
quasar987

5 
2,073 
I would like to make visualisations of calabiyau manifolds, like this...

Aug2808 04:33 AM
SmirkingMan

2 
2,363 
Hi,
Easy question about connectedness. I have from Munkres that the finite Cartesian product of connected sets is...

Aug2608 01:37 PM
quasar987

1 
2,039 
Sorry to beat a dead horse. But, maybe; if someone could explain this slowly just using words to me, it would help a...

Aug2608 12:37 PM
Pjpic

14 
2,560 
I say what is a functional determinant ??
for example Det( \partial ^{2} + m)
is this some kind of Functional...

Aug2308 12:38 PM
Angryphysicist

5 
4,059 
I'm doing a reading of Carroll's General Relativity text, and I am a bit confused about one bit of tensors....

Aug2108 11:45 AM
weejee

5 
1,943 
Consider f: S1 > S1: (cos 2 pi x, sin 2 pi x) > (cos 2 k pi x, sin 2 k pi x).
How to show directly from the...

Aug2108 09:43 AM
NoMoreExams

1 
1,348 
I read, again in Spivak's Calculus on Manifolds, that the integral of 1form over a 1cube is equivalent to a line...

Aug1908 01:16 PM
quasar987

2 
2,013 
Hi people,
I just need to verify that I understand this correctly.
For some four dimensional manifold and group...

Aug1808 01:46 PM
quasar_4

0 
1,478 
Hi fellas
I have been reading Road to Reality by Roger Penrose, but cant go beyond chapter 8. I do not understand...

Aug1708 12:27 PM
harshant

9 
1,954 
Hey, I posted earlier about the tensor covariant derivative, and the help was great, that makes sense to me now.
...

Aug1208 11:02 AM
maze

26 
9,029 
Dear forummembers,
Pestered by many (in my opinion, fundamental) questions and no literature at hand to answer...

Aug1208 10:04 AM
Prz

1 
2,780 
Hello,
I need help. The topic is a gradient in spherical coordinates. In cartesian it is clear but in spherical...

Aug908 05:00 PM
deiki

3 
22,627 
I have a few question, I hope you can help me on some of them.
1.Show that if A (subset of R^n) is a submanifold...

Aug408 08:20 AM
maze

3 
1,891 
I am wondering whether or not anybody has any ideas of how to visualize and calculate the Frechet distance between two...

Aug208 02:28 PM
Dedalus

0 
2,162 
I want to use the theorem that states that if C is the set of critical points in N of a smooth function f:N>M (where...

Aug208 11:39 AM
Anthony

1 
1,871 
The SO(3) group is topologically a 3dimensional ball of radius \pi, if the opposite points on its surface are...

Aug208 07:28 AM
mma

5 
1,932 
I'm trying to study some basic tensor analysis on my own for practical purposes, but I'm having some problems. More...

Jul2908 11:26 AM
Theoretiker

6 
2,839 
Hi,
I have a problem with deriving Einstein equations :
\epsilon_{IJKL}(e^{I} \wedge R^{JK} + \lambda e^{I}...

Jul2708 09:27 AM
astros

0 
1,616 
Hello everyone!
I finished school 2 months ago and at the moment I'm looking forward to my study in physics :)
...

Jul2608 03:48 PM
ForMyThunder

3 
9,931 
Hi everybody!
I have a question concerning tensors and hope you could help me :)
...

Jul2608 05:28 AM
Marin

11 
4,094 
Hey all,
This question stems from Scorpan, "The Wild World of 4Manifolds", pg 302 (and all through that...

Jul2508 11:01 AM
cduston

0 
1,522 
If there is a contravariant vector
v=aa+bb+cc
with a reciprocal vector system where
abc]v=xb×c+ya×c+za×b
...

Jul2408 02:50 AM
ForMyThunder

1 
8,966 
As I understand it, for a tensor of any rank I can produce a corresponding scalar in the following way: Create an...

Jul2108 07:39 PM
snoopies622

9 
2,345 
So I've taken two differential topology/geometry classes both from a mathematics department. I see all over this...

Jul2108 12:04 PM
Cincinnatus

4 
1,892 
Can you give me the definition of exterior covariant derivative or any reference web page ?
Wiki does not involve...

Jul1708 06:20 PM
shoehorn

3 
3,554 
Hey everyone,
I am integrating something (specifically 2forms, but I think this is a general statement) over a...

Jul1608 09:20 AM
cduston

2 
1,489 