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

Feb2313 09:25 AM
micromass

1 
30,944 
Dear there,
A plywood sheet can bend by certain degree before it breaks. Suppose f(x,y) describes the bended...

Apr912 02:12 PM
patiobarbecue

0 
943 
Dear Folks:
Here is the problem: in z<1, we difine a distance between any two points z1 and z2 by d(z1 , z2)...

Apr912 12:12 PM
Fangyang Tian

0 
1,039 
Dear Folks:
I come across the word "cusp" in two different fields and I think they are related. Could anyone...

Apr912 11:22 AM
mathwonk

1 
1,103 
Dear Folks:
It is well known that the preimage of a regular point is a imbedding submanifold, but is it...

Apr912 11:10 AM
mathwonk

2 
1,328 
What's it called when a 3D shape can be made of 2D surfaces of all the same shape and dimensions?
To make a cube, I...

Apr912 04:01 AM
Fangyang Tian

3 
2,245 
Hello! I've read some lie algebra in both group theory books and differential geometry books, and is confused about...

Apr812 11:36 PM
Fangyang Tian

10 
1,933 
Hi!
I'm working through this script and I'm not sure if if there is a mistake at one point, or if I'm just thinking...

Apr812 09:57 PM
quasar987

6 
1,221 
I came across the following statement in this oftenreferenced paper on EinsteinCartan theory (3rd page, righthand...

Apr812 06:02 PM
pellman

3 
1,256 
Hi, I have some more questions about this stuff, which, as always, confuses me. I am (extremely slowly) working...

Apr712 11:14 PM
Matterwave

2 
1,529 
Dear Folks:
Is there any relation between Curvature Operator and Universal Eveloping Algebra, since they look...

Apr712 11:36 AM
Fangyang Tian

0 
966 
i see the definition of differential manifolds in some book for example, NAKAHARA
but what is the definition of...

Apr612 02:05 AM
Matterwave

4 
1,281 
Problem: In circle C chords AB and XY intersect at P. Prove that the projections of P onto AX, BX, AY , BY are...

Apr512 10:38 PM
stanley4430

0 
1,005 
consider we have a map.
what condition should have our map that it has inverse?

Apr412 11:39 PM
Bacle2

2 
1,230 
Hello. I have a question that has been on my mind for some time. I always see in mathematical physics books that they...

Apr412 11:53 AM
Sina

9 
2,070 
Hi!
I'm trying to work through a script on Riemannian submersions but I have some problems with one proof in...

Apr312 07:28 PM
quasar987

7 
1,218 
Hi, All:
It's been a long time since I did this, and I have some basic doubts; please bear with me:
In Lee's...

Apr212 06:04 PM
Matterwave

4 
1,701 
From the things I've read on manifold geometry,metric is a property of the manifold.Maybe you can call it intrinsic....

Apr212 05:05 PM
WWGD

12 
1,802 
Hi, I'm looking for software that allows me to manipulate tensors as symbols themselves, i.e. not as lists of...

Apr212 02:37 PM
vappole

0 
1,273 
I am reading through Kiselev's Geometry: Book I. It is a plane geometry textbook and in the introduction it says the...

Apr212 12:40 PM
Office_Shredder

8 
1,870 
Simple question I am confused on. If I have a tensor M^{\alpha\beta\gamma} that is totally antisymmetric in its...

Apr112 09:41 AM
homology

3 
1,552 
Hello,
I am currently going over Nakahara's Geometry, Topology, and Physics and even though I have bumped into some...

Mar3112 12:33 PM
Office_Shredder

5 
1,944 
I've been thinking about complex residues and how they relate to the topology of a function's Riemann's surface. My...

Mar3012 02:16 PM
DonAntonio

1 
1,266 
How many ways in the entire world are there for computing Puiseux expansions of algebraic functions? I know of three...

Mar2912 06:29 AM
jackmell

2 
1,472 
I want to prove the next assertion in Jeffrey M. Lee's Manifolds and differential geometry.
If \mathcal{D}_1,...

Mar2912 01:02 AM
mathwonk

1 
1,048 
Folks,
I am looking at my notes. Wondering where the highlighted comes from.
Prove that a finite orthogonal set is...

Mar2812 01:28 PM
HallsofIvy

3 
1,390 
I need to prove that every line is contained by at least two planes using only the incidence axioms. This is what I...

Mar2812 12:33 PM
LCharette

2 
1,148 
I need to prove the interior of <ABC is a convex set. I know it is. I started by defining the angle as the...

Mar2812 12:30 PM
HallsofIvy

3 
1,510 
If torsion = antisymmetric part of the connection coefficients, and
...

Mar2712 06:50 PM
kutraj

8 
2,493 
The following is a problem that I’m sure is considered “basic” for mathematicians. I would therefore be gracious if...

Mar2712 01:42 PM
homeomorphic

2 
1,409 
The following is a distance formula for a metric/pseudometric space.
Please. Can anyone give me ANY insight...

Mar2612 07:38 PM
zmodnz

0 
1,180 
Hello,
I'm looking for an appropriate rotation representation for the following situation.
I have two (always...

Mar2612 05:08 PM
sodemus

0 
1,106 
Hi all,
I've been fiddling around with this problem for a while. I intuitively understand that the parallel...

Mar2612 03:39 PM
ianhoolihan

1 
1,262 
Does anyone know if there is a nonEuclidean geometry(or something like that) where the circle becomes a line or a...

Mar2512 05:44 PM
zmodnz

9 
2,182 
Hello everyone! Could someone tell me how to evaluate the integral
\int_{B_{\delta}(p_0)}{\frac{1}{(1 + d^2(p_0,...

Mar2512 04:12 PM
Goklayeh

0 
963 
Hi guys,
I have questions about algebraic functions and not sure where to ask. Hope it's ok here.
Given the...

Mar2512 03:35 AM
jackmell

4 
1,342 
(X,\rho) is a pseudometric space
Define:
x~y if and only if ρ(x,y)=0
(It is shown that x~y is an equivalence...

Mar2512 03:13 AM
Lily@pie

2 
1,471 
Hello all
I was hoping someone could help me with the following problem.
I work on the railroads and my task is...

Mar2412 12:28 AM
chiro

1 
1,656 
Ok, so I don't have much of an intuition for frame bundles, so I have some basic questions.
A frame bundle over a...

Mar2312 07:41 PM
quasar987

39 
3,999 
How do I show that Maslov index satisfies the next property (product property).
Let \Lambda : \mathbb{R} /...

Mar2312 09:56 AM
quasar987

2 
1,167 
Given the complete classification of finite simple groups, can one say that the number of all conceivable 2D/3D...

Mar2312 06:21 AM
M Quack

3 
1,148 