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

Feb2313 09:25 AM
micromass

1 
30,418 
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 
1,928 
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 
1,339 
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 
1,993 
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 
1,473 
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 
1,924 
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 
8,952 
Dear forummembers,
Pestered by many (in my opinion, fundamental) questions and no literature at hand to answer...

Aug1208 10:04 AM
Prz

1 
2,771 
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 
22,529 
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 
1,881 
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 
2,142 
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 
1,860 
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 
1,924 
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 
2,814 
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 
1,599 
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 
9,907 
Hi everybody!
I have a question concerning tensors and hope you could help me :)
...

Jul2608 05:28 AM
Marin

11 
4,069 
Hey all,
This question stems from Scorpan, "The Wild World of 4Manifolds", pg 302 (and all through that...

Jul2508 11:01 AM
cduston

0 
1,512 
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 
8,724 
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 
2,319 
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 
1,877 
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 
3,511 
Hey everyone,
I am integrating something (specifically 2forms, but I think this is a general statement) over a...

Jul1608 09:20 AM
cduston

2 
1,484 
show that there is no immersion of into

Jul1208 10:07 PM
roam

2 
1,579 
In Hartshorne's book definiton of a dimension is given as follows:
İf X is a t.s. , dim(X) is the supremum of the...

Jul1008 08:26 PM
mathwonk

14 
4,809 
Hey everyone,
First of all this is my first post and it's in regards to something I am (supposed to be) learning...

Jul808 09:14 AM
cduston

4 
2,334 
I'm trying to understand how to find the axis of a helix but so far I seem to be hitting a blank. How for instance...

Jul608 04:17 PM
DeaconJohn

15 
6,581 
Can someone elaborate?
Let I = , A = {0, 1, 1/2, 1/3, 1/4, \cdots}. Show that the homotopy extension property does...

Jul408 12:48 AM
eastside00_99

1 
1,786 
I hope I am posting in the right section. I am having a lot of trouble understanding what exactly CW complexes look...

Jun3008 03:25 AM
eastside00_99

1 
2,054 
Hi all,
I do realize that my previous thread on CW complexes was unanswered, so perhaps I am posting my questions...

Jun3008 02:38 AM
eastside00_99

1 
3,663 
Dear friends,
How is the divergence in curvilinear coordinates of a second order mixed tensor defined? I mean, shall...

Jun2808 07:05 AM
haushofer

1 
1,752 
A vector is drawn as an arrow, a covector (oneform) as a series of parallel lines. Is there a way to pictorially...

Jun2208 02:21 PM
robphy

14 
2,992 
Hi, I'm a newbie here and I would like to kindly ask for your collective wisdom on this forum.
I am working on a...

Jun1908 07:29 PM
Ojisan

0 
2,048 
if we have or can have geodesic curves minimizing the integral \sqrt (g_{ab}\dot x_a \dot x_b ) is there a theory of...

Jun1908 09:34 AM
robphy

2 
2,906 
In the attached pdf file i have a few questions on manifolds, I hope you can be of aid.
I need help on question...

Jun1308 05:57 AM
fantispug

1 
1,529 
I am interested in creating a diagrammatic notation editor. Any ideas about how I can do this? What about using Adobe...

Jun308 05:36 PM
Vid

5 
3,140 
I'm reading through Schutz's first course in relativity book and am finding question 12 on page 83 a bit problematic....

Jun308 05:58 AM
Mmmm

1 
1,534 
My question is about vector addition in cylindrical coordinates:
Let A = 2x + y, B = x + 2y. In rectangular...

Jun208 05:33 PM
yungman

2 
5,520 
Hi, I have a computational question which concerns forms. I want to compute the variation of the electrodynamic...

May2908 11:01 AM
haushofer

4 
3,305 
Usually the hairy ball theorem is cited for proving that S^2 is not parallelizable. However, hairy ball theorem is too...

May2808 12:42 PM
mathwonk

27 
6,885 
1. The problem statement, all variables and given/known data
Is the gaussian curvature at a point on the surface
...

May2708 05:14 PM
HallsofIvy

1 
2,158 