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

Feb2313 09:24 AM
micromass

1 
34,285 
Hi
I want to find inverse of singular matrix......
Is there any method to find it???
Please help me out.....
...

Jan1812 06:24 AM
micromass

6 
10,622 
Here is a good question for maths enthusiasts. I really find this sum very tough. Any help, advice or guidance for...

Jan1512 08:31 AM
RamaWolf

2 
2,125 
Does exist general formula for nth term in sequence if I have generative function?
In my case, generative function...

Jan1312 01:41 AM
pablis79

6 
2,381 
Happy new year from France.
I am reading books on elementary particle and i see that their
gauge bosons may be...

Jan1512 11:24 AM
morphism

3 
1,605 
Can you please give an example for a finite group with a three dimensional pseudo real representation? I can find...

Jan1312 07:14 AM
rkrsnan

4 
1,805 
If I were to solve a system of multiple equations in the form
αx+βy+ζz=p_{1}
Where α,β,ζ are constants x,y,z are...

Jan1812 01:40 PM
joebohr

20 
2,753 
Hello
I'm trying to show that the following upper bound on the matrix 2norm is true:
...

Jan1212 06:31 AM
Hawkeye18

3 
2,096 
So I need to calculate the square root of the covariance matrix \sqrt{\Sigma_tR\Sigma_t} (the matrix square root, not...

Jan1112 12:43 PM
Stephen Tashi

2 
1,791 
Throughout this post, I consider "Rmodule" and "representation of R" to be the same.
Similarly, I consider...

Jan1412 10:07 AM
gauss mouse

2 
1,440 
Recently I was assigned to implement a procedure involving "3D projections" to "2D space". Supposing that 3D data is...

Jan1112 03:38 AM
chiro

4 
2,564 
I'm preparing for a qualifying exam and this problem came up on a previous qual:
Let A and B be nxn matrices. Show...

Jan1112 04:07 PM
morphism

5 
2,513 
how does one evaluate the direct product between a group G with components that are say 2tuple and a group H with...

Jan1112 09:22 AM
wisvuze

2 
1,110 
Hi all,
If Zp is the ring of padic integers, what does the notation a = b (mod pZp) mean ? I understand congruence...

Jan1312 05:39 PM
morphism

4 
1,793 
I'm working with universal enveloping algebras, specifically U(sl(2)). Does anybody know of a nice way of determining...

Jan1312 02:39 PM
MrQG

1 
947 
What is the operator inside the Connes' approach to RH ??, he gave a trace but never says what operator is or gives or...

Jan1212 08:29 AM
zetafunction

0 
1,196 
My apologies if this is in the wrong section.... I wasn't quite sure where to put it.
If we have the "Hessian of a...

Jan1212 10:49 AM
brydustin

0 
882 
Prove that (n!)! is divisible by (n!)^(n1)!

Jan1212 11:42 AM
micromass

2 
1,138 
Hi,
Last day I learned about matrix equations like this:
AX = C
A–1AX = A–1C
IX = A–1C
X = A–1C
The...

Jan1412 10:50 AM
rugh

3 
1,674 
In the field of rationals \mathbb{Z}_{(p)} (rationals in the ring of the padic integers), how is it possible to prove...

Jan1512 11:35 AM
morphism

6 
1,990 
Hi all.
I'm working in the set that is formed by extending the integers mod p (p is prime and equal to 3 mod 4) by...

Jan1312 05:36 PM
zack_vt

2 
1,624 
Hi, All:
I was hoping someone would know a source for the Postoffice, say POP problem, n>2.
For n=2, POP asks,...

Jan1612 05:52 AM
Bacle2

2 
1,144 
greetings . i cam across this problem in a research paper i'm writing .
x_1+x_2+.....+x_m=k_1
...

Jan2312 02:03 AM
Stephen Tashi

3 
1,100 
In their article Integrals in the theory of electron correlations, Annalen der Physik 7, 71] L.Onsager at el. write:
...

Jan1912 01:00 PM
Fredrik

1 
1,173 
Hello all!
I realize I am new to the community of online math forums, so I'm probably breaking a few etiquette...

Jan2012 11:32 AM
Nelphine

6 
2,223 
How come the rank of a matrix is equal to the amount of pivot points in the reduced row echelon form? My book denotes...

Jan1912 09:13 AM
HallsofIvy

14 
1,367 
Hi everyone, I need a lot help on how to find automorphisms on these particular Cayley graphs.
I have three groups...

Jan1712 09:33 PM
tsang

0 
861 
I am puzzled about this simple case,
Suppose we have (A+B)T(A+B) <= (A+B1)T(A+B1),
Can we say something about...

Jan2012 11:01 AM
marcusl

1 
1,124 
I am not here to ask a question directly out of the book, but rather I want someone to explain to me something about...

Jan1912 11:43 PM
Deveno

3 
1,395 
Assume some matrix M with m rows and n columns. Let C(M) denote the covariance matrix computed from M. With...

Jan1912 04:01 PM
doobs

0 
827 
I know that \sum_{p\leq n}\frac{\log p}{p}=\log n + O(1), where p ranges over primes, can be proved using the Prime...

Jan2012 11:59 PM
A. Bahat

2 
2,631 
Actually I am new to this topic.
I read few tutorials about LU decomposition of matrix in the net.
A = LU ; A ...

Jan2012 12:14 AM
Muthuraj R

3 
1,012 
greetings . i have come to find that the average of the real parts of the nontrivial zeros of the zeta function is :
...

Jan2012 05:34 AM
mmzaj

0 
1,441 
Apparently there is an isomorphism between the additive group (ℝ,+) of real numbers and the multiplicative group...

Jan2012 01:04 PM
SteveL27

3 
1,511 
We're doing isomorphisms and I was just wondering, is the dihedral group D_{12} isomorphic to the group of even...

Jan2012 02:44 PM
Deveno

2 
1,356 
I am reading Dummit and Foote Chapter 7.
D&F use a quadratic field as an example of a ring. I am trying to get a...

Jan2112 03:33 AM
Math Amateur

7 
1,240 
Can anyone help me with the following exercise from Dummit and Foote?
...

Jan2012 08:27 PM
Math Amateur

3 
1,554 
Hi, I keep seeing indirect uses of a result which I think would be stated as follows:
If a module M over the...

Jan2112 07:49 PM
morphism

4 
1,455 
I am reading James and Liebeck's book on Representations and Characters of Groups.
Exercise 1 of Chapter 3 reads as...

Jan2112 08:59 PM
Math Amateur

2 
1,379 
Using Orthogonal complements, hodge duals and some pattern matching, I derived this formula:
\begin{array}{l}
m...

Jan2112 08:30 PM
dimension10

0 
752 
Suppose you weren't allowed to switch rows, would it then always be possible to turn a regular matrix into the unit...

Jan2212 05:51 PM
Deveno

1 
1,032 