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

Feb2313 09:25 AM
micromass

1 
31,378 
Hello everybody,
How do you prove that,given an ndimensional manifold with constant curvature , i.e.
the...

Apr2211 11:39 AM
camipol89

1 
854 
How can i define the polar coordinate on D^n? I want to prove the theorem which is sometimes called Alexandre trick:...

Apr2211 05:26 PM
seydunas

0 
655 
When you are modelling elements like tubes, the local xaxis is defined along the tubes length.
If a unit vector...

Apr2211 06:43 PM
Unrest

1 
1,343 
I am told that the set of positive definite quadratic forms on R^2 has a metric that turns it into
H x R where H is...

Apr2311 03:36 PM
fzero

7 
2,120 
I've searched everywhere about tensor products but I just can't understand them. Can anyone please explain this...

Apr2411 01:23 AM
dimension10

10 
2,431 
Hi all >>
:blushing:
plz i want answer about defnition of affine hypersurface ??
thank u :smile:

Apr2411 11:20 PM
Ms Mrmr

6 
1,924 
Is the atlas for the sphere consisting of the stereographic projections from north and south pole is an orientable...

Apr2611 04:51 AM
math6

2 
1,218 
hi friends :)
is there someone who has studied the spectrum of a Riemannian Laplacian? I have a question on this...

Apr2611 08:39 AM
math6

2 
1,496 
On a closed surface in 3 space, there is an orthogonal coordinate system around every nonumbilic point that is...

Apr2611 09:15 AM
lavinia

0 
878 
Hii all :smile:
What is Fuzzy manifold ??? and what is deformation ???
thank u >>

Apr2611 07:33 PM
Spinnor

1 
1,241 
A right circular cone with height H and a radius r, is cut by a plane in such a way that the cutting plane cuts all...

Apr2611 10:25 PM
efs

0 
2,012 
the instantaneous axis of rotation of a body rolling on a stationary surface must pass through the instantaneous point...

Apr2711 12:39 AM
klackity

7 
2,113 
I've been looking through my notes for the last few weeks and i still do not see the reason for this use of notation...

Apr2811 07:36 AM
Zorba

5 
1,086 
I would welcome advice on the practical issues of manipulating tensor indices, in particular how to determine the...

Apr2911 01:32 PM
Ben Niehoff

1 
1,763 
Given is a surface embedded in Euclidean 3 space whose Gauss curvature is everywhere positive.
Its metric is...

Apr2911 07:05 PM
lavinia

1 
1,562 
if the first 3D object has 4 points. why use x,y,z to describe 3D? am i confused about one or more concepts? does a...

Apr3011 02:42 PM
DarkenSol

35 
4,085 
I have the result that any 1 dim topological manifold is either R or S1. And I have the fact that every 1dim...

May111 02:08 PM
Hurkyl

4 
1,189 
So this is a pretty specific question, and one that has been puzzling me for a while. Either I'm missing something...

May211 06:03 PM
kupa

0 
939 
Hi, Everyone:
Sorry if this is too simple: I guess the intersection for for CP^2
(complex projective 2space)...

May211 09:08 PM
zhentil

3 
1,152 
I've been studying tensors and GR for awhile now, and I've read a lot of tensor discussions in this forum, but I still...

May211 09:18 PM
zhentil

1 
937 
Hi,
Does anybody know the equations for the Lawson Klein bottle ? I am trying to construct it in a maths graphic...

May311 03:41 PM
lxln

3 
1,502 
Using vector methods:
The figure ABCD is a quadrilateral; P,Q,R,S are the midpoints of the sides AB, BC, CD and DA...

May311 11:41 PM
chiro

1 
2,017 
Can someone please try and explain the Hodge Decomposition for me? I understand the Helmholtz decomposition just...

May411 10:07 AM
LPerrott

0 
882 
I wanted to see how many proofs we could compile on the nonexistence of the titular embedding.
Here's one:...

May411 09:56 PM
zhentil

0 
824 
Hi all,
I am working on a problem from Chaos theory, I have to find the box counting dimension of the set...

May511 08:18 PM
Jamma

14 
1,992 
1) Let e, e' be two orthonormal bases(not necessarily the standard basis). Prove that the matrix S = ee' (direct...

May611 04:50 AM
tinytim

1 
852 
Suppose you have a circle with a diameter of 1. If you draw a square with all four sides touching the circle, the...

May711 06:46 AM
Unrest

4 
1,227 
According to the preceding paragraph,
x^i(t) \equiv x^i (\gamma (t)).
For now, I have the lowly ambition of...

May711 09:18 AM
Rasalhague

4 
1,315 
given an 1form i know how to calculate the exterior derivative 'd'
however how could i calculate the...

May711 07:44 PM
element4

2 
1,820 
Hello everyone,
I need your help in this "simple" geometry problem. I need to find the delta angle, knowing...

May811 06:34 PM
nburo

20 
1,962 
Hi, All:
Just curious as to the definition of the "mod2 reduction of a homology class".
The context is that...

May811 09:10 PM
lavinia

6 
1,730 
Hi
i want to see why the fundamental group of lens space L(p,q) is Z_p. Can you help me?

May911 08:24 AM
seydunas

2 
2,026 
I'm not sure this question goes here, but I'll post anyway.
Is it possible to express the problem of solving...

May911 01:20 PM
jhae2.718

2 
1,245 
I am curious what the wikipedia page <http://en.wikipedia.org/wiki/Pythagorean_addition> is referring to when it...

May911 02:56 PM
micromass

1 
1,454 
Hi
I do 3D modeling and lately i have been trying to make some more theoretic diagrams about the whole thing....

May1011 01:29 AM
Unrest

3 
1,341 
can somebody give a solution to wat the image of x(u,v)=(cos u*cos v,cos U*sin v, sin u) is? where
x:U >R^3
u,v...

May1011 12:34 PM
I like Serena

5 
1,192 
Guys please help me with this:
1) Show that the slice z=c of the sphere x² + y² + z² =1 has the same area as the...

May1111 06:14 AM
Unrest

1 
1,008 
Hello I'm having problems with actually proving this with some mathematics.
Let A, B, C be sets. Prove that if A is...

May1211 07:16 AM
madsmh

2 
1,130 
The following question may be trivial, but I just can't get it figuered out:
Consider the real numbers R with the...

May1211 07:59 AM
holy_toaster

4 
1,213 
I recently came across the fourcolour theorem, and found it so interesting that I spent hours trying to find a...

May1311 05:09 AM
Helios

11 
1,619 