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Differential Geometry

- Manifolds. Tensors and forms. Connections and curvature. Differential and algebraic topology
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Jan16-12 Greg Bernhardt
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:25 AM
1 31,142
This may seem like an easy question, but my differential geometry is a little rusty. I'm trying to find the tangent...
T 02:26 PM
14 2,086
I am sure this should have already be discussed somewhere in the past... I have an intuitive problem with the area of...
T 01:03 PM
3 87
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I've been trying to come up with a oordinate free formula of Christoffel symbols. For the Christoffel symbols of the...
Aug30-14 06:28 PM
9 147
Hi, If we contract a (n-1)d hyperplane with a n-simplex, then what is maximum number of intersection points with...
Aug29-14 03:35 AM
3 184
i really try understand these initial concepts before continue my work, The necessity to use contra/covariants...
Aug28-14 01:29 PM
11 393
In Frankel's book he writes that in R^{3} with cartesian coordinates, you can always associate to a vector \vec{v} a...
Aug27-14 09:14 AM
Greg Bernhardt
1 292
Hey JO, I'm reading a book on geometric algebra and in the beginning (there was light, jk) a simple calculation is...
Aug26-14 03:33 PM
5 299
Does anybody know nice introductory material for K3 manifold/ surface? Some very basic exposition, maybe hidden in...
Aug24-14 12:35 AM
2 2,195
Let me say from the beginning I'm not talking about the non-coordinate unit vectors for polar coordinates. I'm talking...
Aug22-14 08:40 PM
3 260
Alright, so I was reading up on tensors and such with non-Cartesian coordinate systems all day but now I'm a bit tired...
Aug22-14 07:53 AM
5 262
What are tensors?
Aug21-14 02:03 PM
6 498
Hello. I'm learning about Lie derivatives and one of the exercises in the book I use (Isham) is to prove that given...
Aug21-14 05:50 AM
5 296
i'm looking for a curve that would have a shape of a snowdrop (the white spring flower) in 3D space. i have tried some...
Aug20-14 05:19 AM
2 256
Hi all, I am trying to describe/understand how to define a 2-plane distribution in R^3 , i.e., an assignment of a...
Aug20-14 03:51 AM
Pond Dragon
3 263
Hello I've been reading some Group theory texts and would like to clarify something. Let's say we have two Lie groups...
Aug18-14 01:27 PM
2 299
Dear all, I was revising on a bit of tensor calculus, when I stumbled upon this: $$\delta^i_j = \frac{\partial...
Aug16-14 01:32 PM
2 290
I have a cluster of voxels and a 2nd order stress tensor corresponding to each voxel. I was wondering as to what would...
Aug15-14 05:19 PM
1 256
does anyone have a proof of this?
Aug14-14 07:00 PM
2 412
The Maurer-Cartan one-form ##\Theta = g^{-1} dg## is though of as a lie algebra valued form. It arises in connection...
Aug12-14 03:57 PM
Greg Bernhardt
1 516
Hi, I have real problems with the indices here, can someone give me a step by step explanation how to compute stuff...
Aug12-14 03:07 PM
5 1,058
Can somebody explain to me what is a manifold.Also what it means for a space to be curved and how we define...
Aug11-14 05:05 PM
12 838
Hello, the tensor product definition of a two form is \alpha^{1} \wedge \beta^{1} := \alpha \otimes \beta - \beta...
Aug8-14 06:26 PM
10 470
In the formulation of connections on principal bundles, one derives an expression for the covariant exterior...
Aug7-14 11:41 AM
center o bass
4 414
I have an object (A) at some altitude above the Earth ellipsoid, and a point (B) on the surface of the Earth. ...
Aug6-14 12:11 AM
6 969
Hi all, I'm trying (and failing miserably) to understand tensors, and I have a quick question: is the inner product...
Aug4-14 11:17 AM
4 558
It is pretty straight forward to prove that the Kronecker delta \delta_{ij} is an isotropic tensor, i.e. rotationally...
Aug1-14 08:32 PM
6 590
Hi, I'm giving a talk tomorrow morning, and I'd like to use the following fact: a path-connected subgroup of SO(3)...
Jul31-14 12:05 PM
3 497
I finally finished my big summer research project. Reviewing how it went, it is clear to me that I lack an...
Jul24-14 09:14 PM
Pond Dragon
1 1,297
Hey guys, I'm working on a summer research project right now in diff. geo. I'm at the point where I have to define the...
Jul23-14 11:35 PM
Greg Bernhardt
1 2,153
In Nakahara's book, the interior product is defined like this : i_{x} \omega = \frac{1}{r!} \sum\limits_{s=1}^r...
Jul22-14 07:50 PM
11 2,640
I wonder if curvature necessarily means space has been removed. The typical example is forming a "curved" surface by...
Jul22-14 02:31 AM
9 1,044
(From another site) I think the answer is no, for ##i: S \rightarrow \mathbb R^n ## the inclusion/restriction, and...
Jul18-14 05:48 PM
3 1,530
I'm trying to explicitly show that \varepsilon^{0 i j k} \varepsilon_{0 i j l} = - 2 \delta^k_l I sort of went...
Jul18-14 09:11 AM
2 1,465
Long time reader, first time poster. Originally, it was my contention that all Lie groups could be written as the...
Jul17-14 10:36 PM
Pond Dragon
1 1,432
I need to use a computational software to work on tensorial hermite polynomials. The operations I want to perform are...
Jul9-14 08:46 AM
3 3,219
Hello, I'm trying to get a hang of the defintion presented in Arfken - Mathematical Methods for Physicists for 3...
Jul8-14 02:46 AM
2 2,016
I am working on a paper that provides the following formula for computing radius of curvature at a point on a surface....
Jul4-14 10:39 AM
1 3,542
I'm reading about multlinear algebra and I'm stuck at differential form and outer product. The definitions involve...
Jul4-14 12:33 AM
13 4,325
Greetings, I am attempting to compute geodesic distances on manifolds where structural data have been sparsely...
Jul1-14 10:15 PM
Greg Bernhardt
1 2,503

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