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

Feb2313 09:24 AM
micromass

1 
30,482 
I'm having some confusion with index notation and how it works with contravariance/covariance.
...

T 02:52 PM
decerto

0 
63 

 
 
 
Hi,
(hope it doesn't seem so weird),
I'm looking for a general expanded form of
(x+y+z)^{k}, k\in N
k=1:
x+y+z...

T 01:55 AM
sludger13

2 
108 
I am a bit dense when it comes to linear algebra for some reason. I am reviewing math to prepare for a physics grad...

Y 06:38 PM
homeomorphic

7 
213 
I'm hoping that you can help me settle an argument. For a matrix \textbf{M} with elements m_{ij}, is there any...

Apr1814 11:11 AM
SamanthaYellow

3 
162 
The position vector ##\vec{r}## in cartesian coordinates is: ##\vec{r} = x \hat{x} + y \hat{y}##, in polar coordinates...

Apr1814 10:20 AM
Chestermiller

2 
107 
I'm interested in the use/application of the trace of a square matrix?
I am trying to get an intuitive feel for what...

Apr1814 10:20 AM
AlephZero

5 
165 
I've done some more work on my SemisimpleLieAlgebras.zip package, adding decompositions of representation powers. It...

Apr1714 11:59 PM
lpetrich

40 
8,312 
Hi,
I'm new to this subject and wondering if anything is known specifically on the zeroth Gaussian periods of...

Apr1714 08:29 PM
burritoloco

0 
123 
Hi All:
We know that the quotient ## \mathbb Z /2\mathbb Z ## ~ ## \mathbb Z/2 ## . Is there a nice
way of...

Apr1614 09:30 PM
WWGD

2 
164 
Hi,
I am trying to follow an introductory problem in my book for which no solutions are provided and have got...

Apr1614 06:48 AM
jellicorse

2 
171 
I am wanting to find a good proof of the LindemannWeierstrass Theorem.
Most importantly I need the part that...

Apr1414 11:42 AM
jbunniii

1 
222 
I have a uniform grid of data in spherical coordinates. e.g. theta = 0, 1, 2, ... 180 and phi = 0, 1, 2, ... 359 which...

Apr1414 07:12 AM
radiohirsch

3 
1,088 
I'm looking for a proof of a validity of the inequation:
(n1)\sum_{i=1}^{n}x_{i}^{2}\neq...

Apr1314 11:00 PM
Simon Bridge

7 
256 
Given a vector ##\vec{r} = x \hat{x} + y \hat{y}## is possbile to write it as ##\vec{r} = r \hat{r}## being ##r =...

Apr1314 09:54 AM
Mark44

1 
179 
x1 1 1 0 0
x2 0 0 1 1
x3 = 1 + 1 + 0 + ...

Apr1114 07:37 AM
HallsofIvy

2 
270 
Hi. I am reading a physics text, and in one of the lines it uses the following relation:
...

Apr1014 10:54 PM
spookyfish

2 
257 
Hi guys, I have this general question.
If we are asked to show that the direct sum of ##U+W=V##where ##U## and...

Apr1014 09:55 AM
jbunniii

6 
296 
say X = (AB) (B1 C)
B1 = B inverse (B B1 = B1 B = I)
then can i write X = AC?
just having a brain fart...

Apr914 08:11 AM
HallsofIvy

4 
274 
okay so i'm having some conceptual difficulty
given some vector space V (assume finite dimension if needed)
...

Apr914 08:07 AM
HallsofIvy

6 
214 
Hi, i'm reading up on linear algebra and I'm wondering if the remark after a theorem I'm reading here is complete. The...

Apr814 09:24 PM
larusi

8 
338 
hey pf!
so my question is how cramer's rule makes sense from a geometric perspective. i'm reading the following...

Apr814 07:26 PM
chogg

3 
1,050 
##C_0=\{f\in L^p: f(x)\rightarrow 0 ## as ## x\rightarrow infinity\}##
This is an interesting subspace because it...

Apr814 12:57 PM
nateHI

10 
313 
Hello,
I have a 2\times 2 real matrix M such that: M=A^T \Sigma A, where the matrix \Sigma is symmetric positive...

Apr814 02:45 AM
mnb96

0 
247 
Not sure if this is the right subforum.
This is technically a signal processing question, but it edges on proving...

Apr714 11:24 AM
jbunniii

12 
417 
is it true that \frac{1}{g_{ab}}=g^{ba}? I am a bit confused by the index notation. I especially wonder about the...

Apr614 06:12 PM
HallsofIvy

3 
278 
In the following 0/1 matrix I'm trying to identify every largest submatrices formed by 1's as shown in the picture. ...

Apr614 12:20 PM
Mark44

1 
235 
I've been introduced to the definition of a generalised eigenspace for a linear operator A of an ndimensional...

Apr514 10:25 AM
Silversonic

2 
278 
Let's say we randomly select integers to construct a potentially infinite number, for example 3588945.... There is a...

Apr414 12:59 PM
SteveL27

2 
413 
Hello everyone!
I am trying to solve a large system of linear equations. The form of the matrix is A = T + F. T is...

Apr314 08:35 AM
SteamKing

1 
284 
Is there an expression, in general, for the product of two matrix exponentials, for noncommuting matrices?
i.e....

Apr114 12:36 PM
micromass

1 
364 
I was trying to solve the following equation:
\bigwedge\limits_{j=1}^{k}\begin{bmatrix}
a_{1,j}\\
a_{2,j}\\ ...

Mar2814 08:33 AM
brombo

13 
1,930 
Could you explain me:
what the difference is between singular value decomposition and eigenvalue problem,
when...

Mar2814 04:48 AM
UltrafastPED

1 
345 
Hello,
My question is this. Is it possible to prove that there exist an eigenvectors for a symmetric matrix...

Mar2714 10:28 PM
mathwonk

6 
627 
Hi,
Could anyone give me a proof for the following theorem?
Theorem : Ax=0 has a nontrivial solution iff det(A)=0...

Mar2714 06:47 AM
chogg

2 
400 
The interpretation of the vector product is the area of the parallelogram with sides made up of a and b and the scalar...

Mar2614 09:48 PM
chogg

2 
464 
In this video https://www.youtube.com/watch?feature=player_detailpage&v=INfPkT9EkhE#t=415, the presenter gets (1, 1)...

Mar2514 08:23 AM
HallsofIvy

2 
454 
Dear All,
I need some explanations of properties of tensor and the tensor product on different states;...

Mar2514 07:19 AM
ChrisVer

1 
510 
If u × v = u × w, so v = w ?

Mar2314 03:32 PM
mathman

5 
582 
Hi everyone,
I have a general question regarding KPM. Since kronecker product matrices have cartesian tiling, I was...

Mar2214 01:02 PM
Stephen Tashi

1 
419 