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

Feb2313 09:25 AM
micromass

1 
29,467 
I need any help with the next question I posted in math.stackexchange, thanks....

Mar1412 12:36 PM
MathematicalPhysicist

8 
1,049 
The vanishing divergence(s) of the stressenergy tensor, which proves/demands (not sure which) the conservation laws...

Mar1312 10:17 PM
marschmellow

0 
980 
I have made a geometry, see first attachment, I call the “Torbus”, from the two geometries of a Toroid and a Mobius...

Mar1312 02:40 PM
Ray Fischer

13 
2,453 
Or perhaps there is a more general function that sends to the next hypervolume? Can it be bijective? Continuous?

Mar1312 01:31 AM
Bacle2

7 
1,151 
Hello all
I work in railway transport.
I am trying to redesign an existing railway curve; the existing...

Mar1212 08:48 PM
Stephen Tashi

1 
872 
I'm just learning manifold geometry and tensor analysis.From the things I've understood till now,an idea came into my...

Mar1212 09:45 AM
Shyan

3 
1,004 
I've been trying to find an algorithm for finding a line passing through any 2dimensional polygon that will divide...

Mar1112 09:49 AM
jamnitzer

0 
1,206 
For you math people who like to express objects in a coordinatefree way, how would you denote the Riemann and the...

Mar1112 09:01 AM
Matterwave

3 
913 
Hi,
We are using a radio interferometer to measure the angular diameter of the Sun.
An in depth description of...

Mar1112 04:55 AM
omoplata

2 
941 
Dear all,
I am sorry for making a rather useless thread, but could you please guide me towards any relevant...

Mar1012 12:39 PM
Charles_Henry

0 
952 
Hi, I can't find any picture of a twotorus T˛ in the net after much searching. Does anyone have a link or can draw...

Mar812 10:55 AM
mathwonk

4 
1,405 
Hi,
I was wondering whether it's possible to define a rotation in 3 dimensions about the origin. Is it necessary to...

Mar812 10:52 AM
mathwonk

3 
1,386 
Hi all,
I am trying to make sense of a paper involving differenital geometry and Lie algebras. Here's the part I am...

Mar712 01:20 PM
ianhoolihan

1 
1,143 
Hi, I'm just wondering, a vector valued (or (n,0) tensor valued) p form is the same as a rank (n,p) tensor which is...

Mar712 01:36 AM
Matterwave

7 
1,813 
Hi,
I want to rotate vectors through 120 and they are unit vectors so they lie on a unit spheres. So basically the...

Mar412 11:01 AM
tut_einstein

4 
1,643 
I am trying to calculate the covariant derivative of the Ricci Tensor the way Einstein did it, but I keep coming up...

Mar312 06:29 PM
nobraner

0 
1,134 
I don't know anything about Unitary Ball
what is a Unitary ball? how make a unitary ball consider to a metric...

Mar312 02:37 AM
Matterwave

7 
1,192 
Assuming that we are working with an infinitessimally small region of a manifold so that we can consider only first...

Mar312 01:19 AM
Matterwave

14 
1,990 
Continuity equation is
dj+\partial_t\rho_t=0
where j and \rho are a timedependent 2form and a timedependent...

Mar212 01:10 AM
mma

2 
1,619 
Hi
Let D be an anisotropic tensor. This means especially, that D is traceless. \mathrm{tr}(D) = 0
Apply...

Mar112 12:42 PM
Joschua_S

5 
2,606 
Greetings,
I wonder if a proof of the relation between the directional cosines of two vectors and cosine between...

Feb2912 12:37 PM
Septim

5 
1,532 
Here is my maths seminar video:Visible Fibre Bundle,discussing the vivid picture of fibre bundle which is the basic...

Feb2912 07:52 AM
Tinyboss

1 
1,338 
Hi Everyone!
Somewhere I read <:uhh:or possibly I think so and am wrong> that christoffel symbols correspond to...

Feb2912 03:43 AM
Matterwave

1 
1,182 
I've been looking in various books in differential geometry, and usually when they show that a smooth manifold has a...

Feb2812 09:28 PM
mathwonk

7 
1,736 
Hey guys, I'm looking for a good treatment (good = concise, and clear) of affine geometry. Connections, parallel...

Feb2812 11:10 AM
Matterwave

4 
1,425 
Hi, I'm not sure if this is the right place for this....if it isn't if I could be redirected/if a moderator could move...

Feb2812 01:05 AM
Bacle2

2 
1,590 
Hi everyone:
How is the following derived? Just for example:
...

Feb2712 07:31 AM
dpa

5 
1,518 
How does one compute the modular group of the torus? I see how Dehn twists generate the modular group, and I see how...

Feb2612 09:17 PM
electroweak

2 
1,465 
By continuity I mean an unbroken fractal. With certain variants, one ends up with sharp gaps in the fractal.
...

Feb2612 06:58 PM
Matt Benesi

4 
1,366 
I would like to study the path components (isotopy classes) of the diffeomorphism group of some compact Riemann...

Feb2612 08:20 AM
quasar987

2 
1,381 
Hi All,
I am an idiot but I donot understand the parallel transport:
Parallel transport should be in surface...

Feb2612 05:30 AM
arkajad

3 
1,101 
Wikipedia gives the relationship between a cartesian and curvlinear coordinate system as
gi=(partial)x1/(partial)zi...

Feb2512 05:26 PM
Group_Complex

0 
1,108 
Hi all,
I am a little stuck on a problem I'm trying to solve for something I'm programming.
I'm trying to find the...

Feb2512 04:11 PM
Snoopey

2 
1,766 
Hi friends !!
Let E be a holomorphic vector bundle over a complex manifold M . We identify M with the zero section...

Feb2412 10:19 PM
mathwonk

2 
1,383 
i am trying to figure out how to calculate the circumference of a circle in the Poincare Half Plane. I know that...

Feb2312 02:54 PM
arkajad

1 
1,380 
Hi can anyone help me out with finding the interior angles of a pentagon on a sphere. I know two of the interior...

Feb2312 01:59 PM
mathwonk

2 
1,704 
I don't understand the fibre bundle structure of the Mobius band, described by my textbook.
"The base space ##X## is...

Feb2312 01:26 PM
Bacle2

11 
2,080 
Hello Everyone,
I'm currently working through a differential geometry book that uses Clifford's algebra instead of...

Feb2212 05:07 PM
arkajad

6 
1,675 
Hi
English is not my native language and I have these type of questions all the time.
I would like to know if the...

Feb2212 07:57 AM
probiner

2 
1,087 
Get latitude/longitude coordinates for NSWE corners from a center point 800ft out to each NSWE corner.
For example...

Feb2212 02:09 AM
programguru

0 
1,376 