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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
micromass
1 31,077
If I have a plane with four corner 3-D (x,y,z).. et ceteraa in a coordinate system, how do I translate and rotate it...
Jul26-05 09:37 PM
laminatedevildoll
2 6,759
If I stretch an ellipse with .5 eccentricity along an axis 45 degrees from its major axis, doubling its area. How do I...
Sep8-08 08:31 AM
Keys
4 6,745
I found it is hard for myself to follow the book on general topology by willard, since there are too many abstract...
Jan19-10 05:34 AM
bobydbcn
10 6,734
Hello, I'm doing some early work in my PhD and I'm coding a micromechanical scheme in which I have many 4th order...
Jun20-07 10:19 AM
explain
6 6,659
Hello, I'd like to learn about tensors so i can start learning about special relativity. I understand nothing right...
Dec10-06 05:26 PM
andytoh
16 6,652
Hey guys, How exactly do you take the trace of a tensor product? Do I take the trace of each tensor individually...
Nov21-08 06:25 AM
tiny-tim
8 6,647
I know that th three dimensional case was discovered by William Thompson, but who discovered the general case?
Apr8-06 12:30 PM
leach
10 6,639
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...
Jul6-08 04:17 PM
DeaconJohn
15 6,633
If I have a (1,1) tensor, eg a Lorentz transform, how do I write its inverse? For example: x'^\mu=\Lambda^\mu_\nu...
Mar14-09 06:23 PM
cristo
5 6,594
Dear all, I can formally understand one of the many definitions of tangent vectors to a manifold, but what are they...
Oct17-08 12:12 PM
wofsy
32 6,580
Hello to all, can somebody explain all the details of a Surface Patch? I have read some material for that but it...
Jun8-04 12:06 AM
sambo
1 6,571
Hi, Everybody: I am trying to understand torsion and relative cycles in a more geometric way; I think I...
Dec2-10 08:32 PM
quasar987
17 6,516
OK, this is more of a spot for an elaboration on a question I just posted in another thread. Not quite duplicating...
Feb1-06 08:46 AM
bchui
5 6,486
hi, i am trying to prove that \nabla V which has components (\nabla V)^\alpha{}_{\beta} = V^\alpha{}_{;\beta} is...
Oct31-04 09:31 PM
mathwonk
18 6,459
I've heard of something called a covariant derivative. what motivates it and what is it?
Mar18-07 05:16 PM
Terilien
12 6,419
So, where do I begin? I have a current interests in going into Algebraic Topology and I am currently learning about...
Feb7-06 01:42 PM
Doodle Bob
28 6,364
I often think I have fully understood this, then some question comes up in my mind, and I get confused again (which...
Jul10-06 07:03 PM
mathwonk
19 6,358
:confused:
Apr18-07 07:40 AM
pmb_phy
7 6,349
i don't know if i can post it here, like this man http://www.physicsforums.com/showthread.php?t=397395, there's alot...
Oct6-10 05:52 AM
annoymage
2 6,335
I learnt that there exists a difference between Lie transport and parallel transport and what that difference is in...
Mar31-04 08:51 PM
maddy
10 6,288
one elementary result that you see when you first learn differential geometry is that the pushforward of the Lie...
Jun16-11 10:17 AM
Yannick30
3 6,274
I'm currently reading through Roger Penrose's book The Road to Reality and in his Hyperbolic Geometry discussion he...
Aug27-10 11:16 AM
Kevin_Axion
2 6,268
I wonder if anyone might have some suggestions for a good self-study book on tensors. I'm just starting in on Jackson...
Sep1-06 09:15 PM
Daverz
5 6,265
I'm looking for a function f: -> R such that |f| and f2 are integrable on any helps?
Feb4-09 06:40 AM
irresistible
5 6,247
Can a killing vector field generate a diffeomorphism that only shifts points inside a small part of the manifold and...
Mar22-07 10:17 PM
kakarukeys
3 6,235
Hi! Im trying to get an intuition for these concepts and was just playing at home. My thought was to start with a...
Feb14-12 12:29 AM
julian
23 6,222
Let A be the adjacency matrix of some graph G. I am aware that A^n counts paths of length n between vertices of G,...
Dec14-09 05:32 PM
asja
0 6,208
Hi, I'm trying to convert latitude and longitude into meters (x,y). I was thinking of UTM however I don't understand...
Dec5-10 07:19 AM
awkward
3 6,199
im thinking of taking in 2008 the second semester a course in analysis of manifolds. now some of the preliminaries...
Sep11-07 10:51 PM
MathematicalPhysicist
9 6,162
im looking for a basic high school level geometry book to tech myself from i looked on amazon for a book and i found...
Jul21-09 11:24 AM
Capt. McCoy
2 6,149
I've just begun investigating differential forms. I have no experience in this field and no formal, university level...
Jun2-11 03:06 PM
shrubber
11 6,087
Is the matrix of a second order symmetric tensor always symmetric (ie. expressed in any coordinate system, and in any...
Apr26-07 10:02 AM
BobbyFluffyPric
10 6,085
I'm trying to build up enough understanding to work through some GR on my own, but I'm horribly confused by some of...
Feb5-09 04:25 PM
CompuChip
6 6,051
Hello. This is 2D with arbitrary orientations. I have a quadratic curve segment defined by 2 end points and another...
Aug26-11 10:26 AM
Unrest
18 6,047
I asked this question in an SR thread started by someone else but it really belongs in this forum. I received much...
Jul4-07 11:17 AM
llarsen
29 6,001
Let X be a compact space, (Y,p) a compact metric space, let F be a closed subset of C(X,Y) (the continuous functions...
Feb21-08 01:00 PM
MathematicalPhysicist
15 5,988
I try to understand the notion of connections on fibre bundles from the lecture notes Preparation for Gauge Theory by...
Sep12-06 03:09 PM
mma
17 5,979
In attempting to arrive at a fair critique of Alexander de Seversky's "Combat Plane" concept, I discovered something...
Aug7-11 09:32 AM
Dickfore
24 5,963
Under which conditions is an inverse of a continuous bijection continuous? I'm not seeking for "the" answer. There...
May17-09 10:34 AM
quasar987
10 5,960
Ok, one more diff geometry question! I need to show the following: Show that if Cij are components of an...
Oct9-08 10:13 AM
cathalcummins
32 5,941

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