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

Feb2313 09:25 AM
micromass

1 
26,567 
I'm doing some programing and I am wondering how I can find the length of a Polygon's side (variable number of sides)...

Sep1508 03:36 PM
therealdrag0

2 
7,532 
How can I find the radius of a circle by knowing two points and its arc length? Do I have to use a numerical method to...

Jan812 10:04 AM
D H

11 
7,484 
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 
7,385 
for those of you who've done it, how long does it take to read it? all 13 books.

Dec408 10:56 AM
mathwonk

6 
7,331 
Hello,
First of all, please excuse me if I posted in the inappropriate place.. While a student few years ago, I...

Apr2012 11:53 AM
lavinia

44 
7,312 
when a space (or spacetime) is said to be maximally symmetric, does this mean that it is homogeneous?

May3109 06:57 PM
apeiron

6 
7,191 
Hi can someone help me prove this identity? I'm having trouble understand the role of the interior product or more...

Dec2306 07:14 AM
coalquay404

3 
7,122 
Hi,
I have met a problem, that is how to prove transformation law for Christoffel symbol of first kind. I have read...

May2409 03:54 AM
hyjta

4 
7,117 
Having some knowledge of differential geometry, I want to selfstudy topology. Which of the two areas shall I study...

Apr3010 10:47 AM
lavinia

5 
7,088 
Can anybody give me an explanation about non coordinate bases and its importance?

Feb206 07:26 AM
George Jones

17 
7,067 
i've been trying to find a good set of lecture notes for independent study on the subject. I wen to the one in the...

Jul2306 12:48 PM
attacc

18 
7,045 
Although, the dot product works in infitine dimensions, it is not the case for the cross product. Anybody know in what...

Mar605 04:22 PM
HallsofIvy

4 
7,034 
I was reading lethe's thread on differential forms and suddenly it dawned on me that I had no idea what differential...

Aug1004 07:07 PM
mathwonk

20 
6,995 
Hi, I don't know if this is the right place to post, but can someone help me understand what differential forms are...

May1509 01:33 PM
guhan

19 
6,953 
If a vector is simply "any quantity having magnitude and direction", then how can a vector's components NOT transform...

Apr2007 11:53 PM
mathwonk

42 
6,876 
Just wondering if Traces can be applied to tensors.
If the Ricci tensor is Rii then is sums over diagonal elements....

Jan1110 12:02 PM
Omega137

7 
6,854 
Ruslan Sharipov has a nifty online textbook on this subject. It's written in interactive doityourself style. Give it...

Mar2404 03:57 PM
pmb_phy

3 
6,842 
Hi , everyone
I have a problem with geodesic equation .
I know the method of solving it , but I can't understand the...

Apr1508 05:21 PM
the shadow

14 
6,841 
hi
i want to know why while dealing with any noise based application noise is assumed to be gaussian distributed?
...

Oct2308 02:58 PM
statdad

6 
6,822 
i am a student of physics
i do not know much about the chern number
i wonder why the chern number must be an...

Jul711 11:24 AM
element4

12 
6,822 
How do you prove that for a set of coordinates you are supposed to take
\mathrm{d}s^2=\mathrm{d}x_i\mathrm{d}x^i
for...

Jan3110 08:26 AM
HallsofIvy

25 
6,821 
Hi
I'm looking for a simple definition fo the affine connection because I can't understand it's meanning , that...

Apr908 01:55 PM
LorenzoMath

12 
6,677 
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 
6,664 
Definition of surface from Pressley's "Elementary differential geometry":
A subset S of \mathbb{R}^3 is a surface...

Oct2706 12:31 PM
matt grime

9 
6,658 
Can somone remind me how to see that the Lie derivative of a vector field, defined as
(L_XY)_p=\lim_{t\rightarrow...

Oct1809 01:38 PM
haushofer

20 
6,628 
Hi i'm using Kreyszig's Introductory Functional Analysis with Applications and he proves that the set of continuous...

Jun2710 02:44 PM
Landau

7 
6,606 
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 
6,596 
there is a general result that
RPn is orientable if n is odd while nonorientable if n is even
how to prove this...

Sep2010 02:24 PM
mathwonk

25 
6,562 
I need to show a particular map f:M>N is an isometry (globally). M,N are riemannian manifolds, p is a point on M....

Mar1608 10:34 PM
Cincinnatus

4 
6,558 
edit: This thread might need moved, sorry about that.
Hi, I have ended up on this site a few times after searching...

Dec1509 05:56 AM
HallsofIvy

5 
6,550 
I need to show that a countable intersection of open and dense sets (the sets are open and dense at the same time) in...

Sep2608 03:17 AM
MathematicalPhysicist

7 
6,515 
If I have z=f(x,y), then how would I go about finding the inverse function?
More specifically, say I have a...

May1106 04:57 PM
mathwonk

1 
6,506 
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 
6,420 
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 
6,415 
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 
6,375 
What is a very good differential geometry introductory text?
My only background is Calculus (spivak). however, I'm...

Jul2509 08:23 AM
slider142

8 
6,355 
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 
6,352 
Dear All,
I have inherited a few rotation matrices through some old computer code I am updating. The code is used...

Dec310 03:14 PM
neorich

2 
6,339 
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 
6,333 
Hi everybody,
How can one show that the tangent bundle TS² of the 2sphere is not trivial ? I know we can use the...

Mar309 08:32 AM
wofsy

8 
6,326 