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

Feb2313 09:25 AM
micromass

1 
30,268 
Hi all!
It's already a couple of days that I'm trying to solve this problem. I've been given the following Kahler...

Jul812 04:37 AM
L0r3n20

3 
1,085 
On page 333 in Section 52: The Fundamental Group (Topology by Munkres) Munkres writes: (see attachement giving Munkres...

Jul712 09:06 AM
lavinia

3 
1,176 
This thread asks for help calculating the Z2 cohomology ring of the Klein bottle using intersections.
This is what...

Jul712 08:07 AM
lavinia

3 
1,707 
Can someone explain to me in detail, why the ratio of the circumference of a circle to its diameter is not equal to pi...

Jul512 05:46 PM
Allojubrious

11 
1,679 
I'm not sure if this is the right section, but what the hell.
I've been looking to buy a bluray of fractal zooms,...

Jul512 02:55 PM
Doofy

0 
745 
There is a part in the proof of sard's theorem where we restrict our discussion to a point x such that Df(x)=0, and...

Jul512 02:53 PM
Tinyboss

1 
961 
I am reading Thurston's book on the Geometry and Topology of 3manifolds, and he describes the metric in the Poincare...

Jul512 02:25 PM
L0r3n20

4 
1,499 
Hello,
In R^3, the surface of the parallelogram determined by two vectors u and v is given by the norm of the cross...

Jul412 02:24 PM
coquelicot

26 
1,905 
Hi!
Does anyone know which is exactly the map of groups (2,3,∞) → (2,3,n) (from modular group to triangle group) as...

Jul412 07:25 AM
mery2

0 
687 
Hello,
I want to ask for a verification of something I did. Lets say I want to compute the mth cohomology group of...

Jul312 08:35 PM
lavinia

3 
1,569 
I think this a map of the Klein fourgroup geometry. Comments?...

Jul312 07:36 PM
micromass

57 
9,021 
Dear all,
I have a problem that I need to solve. (I have made posts previously about this as well). Quite simply...

Jul212 11:28 PM
chiro

1 
1,349 
consider we have n dimensional manifold,N
at point p we can define a vector
this vector is independent of our...

Jul112 06:07 PM
HallsofIvy

1 
591 
{(a_i)_j} is the dual basis to the basis {(e_i)_j}
I want to show that
((a_i)_1) \wedge (a_i)_2 \wedge.... \wedge...

Jun2812 03:16 PM
brydustin

1 
798 
Desargues' theorem:
Two triangles are in perspective axially if and only if they are in perspective centrally.
I...

Jun2612 05:10 PM
Ironben

0 
793 
Hi, I hope this is not too ignorant, but my Algebraic Topology is rusty:
Is there such a thing as DeRham...

Jun2612 07:30 AM
lavinia

10 
2,908 
Hi all!
I have some problems understanding the geometrical construction of Klein's quartic.
Starting from the...

Jun2512 04:12 PM
AntiCrackpot

1 
1,116 
Hi!
I'm trying to understand a proof for the fact that the isometry group of a symmetric space is a Lie group. The...

Jun2512 02:51 PM
Sajet

0 
727 
Hello,
I'm trying to define an axis as a set of 3 unit vectorsu, v, and w. at a given point P
Suppose we are...

Jun2512 09:16 AM
meldraft

3 
1,525 
Consider the following:
On a circle of radius 1, two points are marked: P1 and P2.
Two lines are drawn from the...

Jun2412 07:27 PM
Tinyboss

1 
888 
hi friends !! i have a little problem :
Let M and N be two varieties, such that N is a menu hermitian metric h. Let...

Jun2412 03:48 PM
math6

0 
802 
Hi!
I'm trying to give a few examples of symmetric manifolds. In the article "Introduction to Symmetric Spaces and...

Jun2412 05:40 AM
Sajet

6 
1,675 
Hello everyone,
Let r(u_i) be a surface with i=1,2. Suppose that its first fundamental form is given as
ds^2...

Jun2312 12:46 PM
lavinia

8 
1,878 
Hi!
Suppose we have a topological space X, a point x\in X and a homomorphism \rho:\pi(X,x) \rightarrow S_n with...

Jun2312 12:46 PM
mathwonk

3 
1,200 
Rao: Topology: Proposition 1.2.4. If (X,T) is a topological space, a subset A of X is closed iff the the derived set...

Jun1912 10:47 PM
micromass

1 
1,044 
My question is mainly concerned with discovering the allowable set of "configurations" of the given problem:
We...

Jun1812 01:57 PM
cstellar

0 
843 
I am looking for a theorem that states approximately the following:
An ndimensional object, while appearing...

Jun1812 11:40 AM
Spacie

0 
815 
I am working on a Matlab sim and I need to find the shorted distance of a point to an Elliposid surface.
The point...

Jun1812 09:00 AM
HallsofIvy

1 
1,241 
consider t is arbitrary tensor and is Lie derivative
how can we show that
Lt=Lx Ly t  Ly Lx t

Jun1812 03:58 AM
Fredrik

1 
1,146 
Let RP2 denote the real projective plane (it can be obtained from glueing a Mobius band and a disk whose boundary is...

Jun1712 02:02 PM
Jamma

23 
4,123 
I'm reading a paper and have came across the term 'Cnclose' in the sense of a curve being C1close to a circle for...

Jun1712 01:12 PM
quasar987

1 
968 
Hi ALL,
I'm glad I found this Forum. I'm an engineer, rusty with my math, building a practical prototype sensor...

Jun1712 10:51 AM
PVwizard

0 
676 
Hello!
Is any covariant vector orthogonal to absolute derivative of its contravariant counterpart?
I read a GR...

Jun1612 09:58 PM
rbwang1225

1 
976 
maybe its simple permutation and combination technique... I ve tried to resolve it on my own but I couldn't...The...

Jun1612 09:35 PM
Muphrid

4 
1,071 
I know the following
xy \leq x+y \leq x + y
where does xy fit in the above equation?

Jun1612 09:28 AM
vrmuth

5 
1,425 
Hi all!
Can you please guide me how to find the quadrature point of a pentagonal cell elements.

Jun1512 09:18 AM
Prabhat Kumar

0 
850 
"Let f,g:Sn→Sn be maps so that f(x) and g(x) are not antipodal for any x. Show that f and g are homotopic."
Here's...

Jun1512 01:55 AM
Bacle2

8 
1,657 
Hello! I'm currently reading John Lee's books on different kinds of manifolds and three questions has appeared.
In...

Jun1412 12:59 AM
spoirier

4 
1,926 
What does orbifold means? The wikipedia article says it is a generalization of manifolds which looks like a quotient...

Jun1312 08:28 PM
mathwonk

10 
2,119 
Prove or disprove that f is a quotient mapping.
f:R^3\{(x1,x2,x3):x1=0}>R^2 defined by
...

Jun1312 01:26 PM
Alesak

3 
1,143 