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

Feb2313 09:25 AM
micromass

1 
31,077 
If I have a plane with four corner 3D (x,y,z).. et ceteraa in a coordinate system, how do I translate and rotate it...

Jul2605 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...

Sep808 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...

Jan1910 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...

Jun2007 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...

Dec1006 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...

Nov2108 06:25 AM
tinytim

8 
6,647 
I know that th three dimensional case was discovered by William Thompson, but who discovered the general case?

Apr806 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...

Jul608 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...

Mar1409 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...

Oct1708 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...

Jun804 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...

Dec210 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...

Feb106 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...

Oct3104 09:31 PM
mathwonk

18 
6,459 
I've heard of something called a covariant derivative. what motivates it and what is it?

Mar1807 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...

Feb706 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...

Jul1006 07:03 PM
mathwonk

19 
6,358 
:confused:

Apr1807 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...

Oct610 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...

Mar3104 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...

Jun1611 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...

Aug2710 11:16 AM
Kevin_Axion

2 
6,268 
I wonder if anyone might have some suggestions for a good selfstudy book on tensors. I'm just starting in on Jackson...

Sep106 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?

Feb409 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...

Mar2207 10:17 PM
kakarukeys

3 
6,235 
Hi! I´m trying to get an intuition for these concepts and was just playing at home.
My thought was to start with a...

Feb1412 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,...

Dec1409 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...

Dec510 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...

Sep1107 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...

Jul2109 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...

Jun211 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...

Apr2607 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...

Feb509 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...

Aug2611 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...

Jul407 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...

Feb2108 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...

Sep1206 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...

Aug711 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...

May1709 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...

Oct908 10:13 AM
cathalcummins

32 
5,941 