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

Feb2313 09:24 AM
micromass

1 
35,895 
Hi,
I need to write a code to convert a symmetic matrix into tridiagonal form and am planning to use the...

Mar2412 12:41 PM
Hassan2

13 
2,977 
If A = {(x,y) : x³ = y² = e, yx = xˉ¹y} and B = {(u,v) : u^4 = v² = e, vu = uˉ¹v}, how do I go about finding the...

Mar2812 12:02 AM
DonAntonio

1 
2,270 
true or false ..
The system {S,+,.} with S = { matrix (a,b,ab,a)a,b ∊ R)
is not a field under matrix addition (+)...

Mar2812 07:39 AM
dodo

1 
748 
Here is an algorithm very simple to find a common factor to a and b.
An example :
a=867
b=1989
1. We compute...

Mar1812 07:38 PM
Gaussianheart

20 
3,000 
Hey,
i've been trying to find a better fit for a correlation, the numbers i'm dealing with are really small and when...

Mar2112 11:27 AM
Stephen Tashi

1 
1,885 
Hello Everyone :)
I have been facing a little difficulty when encountering such kind of problems . i have also...

Mar1912 07:56 PM
ajkoer

8 
1,202 
How do I show that for any vectors u,v, and w in a vector space V, the set of the vectors {uv, vw, wu} is a...

Mar1912 11:39 AM
HallsofIvy

6 
2,952 
Q. Given that A is invertible , check whether A + A^(1) is invertible or not ?
A. A is invertible . => A^1 exists...

Mar2112 08:03 AM
vish_maths

13 
1,713 
Hello
I have this Hamiltonian:
\mathcal{H} = \alpha S_{+} + \alpha^{*}S_{} + \beta S_{z}
with \alpha,...

Mar1912 09:08 AM
Joschua_S

0 
1,247 
Hi i found a question in number theory, involving two equations, it goes as follows:
Let p1, p2, p3 and p4 be 4...

Mar1912 06:11 PM
Norwegian

1 
2,266 
I think I found a procedure (other than the extended Euclidean algorithm) to compute the multiplicative inverse of a...

Mar2012 05:20 AM
dodo

0 
1,392 
Hi everyone, I always have trouble on decomposing number into irreducible factors inside Gaussian integer field. I...

Mar2112 05:50 AM
Norwegian

3 
1,080 
This is dealing with computer vision, but the only part I'm having trouble understanding is a step in the matrix math....

Mar2312 01:33 AM
Stephen Tashi

6 
1,460 
I got one example on my notes about PID and maximal ideal. I feel it is a strange example as it doesn't make sense to...

Mar2112 10:12 AM
mathwonk

2 
1,385 
Firstly, I am not sure if I am in the right section. Pardon me.
I was reading something related to computational...

Mar2212 07:57 AM
rukawakaede

9 
3,008 
We learned the GSP yesterday in class, but my teacher said something that seems to conflict with the textbook.
He...

Mar2112 10:06 AM
mathwonk

1 
894 
I have some questions about spanning sets
1. Why does empty set spans the zero subspace?
2. Why is this true:...

Mar2112 10:41 AM
mathwonk

5 
969 
Hi, I know next to nothing about abstract algebra (had one introclass years ago), so sorry if this is a dumb...

Mar2212 03:10 PM
mathwonk

5 
1,295 
I am readin Belinte's book about Lie algebras (I have also the Cahn) .
And I try to understand this. He writes
...

Mar2312 11:38 AM
naima

2 
868 
Some algorithms of finding the eigenvalues of symmetric matrices first transform the matrix to a tridiagonal matrix...

Mar2212 08:07 PM
Hassan2

2 
1,540 
Hi, I am told to give the subgroup H=<α,β> with α,β\inS3
α = (1 2)
β = (2 3)
So I know that H={αkβjj,k\in(the...

Mar2212 10:44 PM
HallsofIvy

1 
1,683 
Say i have the following function:
f(x)= {45 , x<0.5
45 , x≥0.5}
where x\in R is a real variable in ....

Mar2312 12:20 AM
chuy52506

3 
1,941 
I asked this question on one another forum but didn't get any answer .
Consider the following array of natural...

Mar2712 11:02 AM
ramsey2879

7 
2,423 
When we talk about an abstract binary operation *:SxS > S
We say that an identity element "e" exists when e * x =...

Mar2312 11:42 AM
dijkarte

2 
964 
I did these years ago. I remember that there used to be an order, that if you followed, you always got the answer. ...

Mar2312 01:26 PM
tony873004

0 
807 
Given n by n matrices A, B, C. I know how to solve the Sylvester equation
AX + XB + C = 0
using the matlab...

Mar2612 03:24 AM
chiro

3 
1,630 
hello :)
I was trying to prove the following result :
for a linear mapping L: V > W
dimension of a domain V =...

Mar2712 06:29 AM
vish_maths

5 
1,187 
Is it true that SO(3) has no complex 2dimensional representation (except the trivial one...)? How to see this? If it...

Mar2412 06:40 PM
quasar987

2 
1,141 
Let a, b, and c be elements of group <G, *>, then
Can we apply cancellation law here:
a*b = c*a???
I could prove...

Mar2412 11:22 PM
dijkarte

8 
1,591 
Hi, All:
I have been tutoring linear algebra, and my student does not seem to be able
to understand a...

Mar2512 09:51 PM
Bacle2

5 
1,072 
I'm completely lost on this one. I need this to be able to solve that the square root of three is irrational. So it's...

Mar2612 04:55 PM
20Tauri

4 
1,957 
Hello,
it's been a while since i did linear algebra. i need some help. I have this matrix:
1 1 0
0 1 0
0 0...

Mar2512 08:34 PM
HallsofIvy

1 
1,569 
Hi Everyone,
I am kind of looking some online text to understand Lie Algebra, Group Theory and so forth.
I usually...

Mar2712 08:39 PM
chiro

9 
1,758 
Suppose a (n x 3) matrix B is given, n>3. Also, suppose a matrix (3 x 3) matrix C is given, whose columns correspond...

Mar2612 02:58 AM
chiro

1 
1,003 
How the hell do you prove that the components of a vector w.r.t. a given basis are unique?
I have literally no idea...

Mar2612 01:38 PM
dodo

3 
921 
While studying groups,
Is there a common pattern/arrangement of the group elements represented in a table?
Is...

Mar2712 03:55 PM
Number Nine

9 
953 
Well, I have solved this problem from a textbook:
Prove the Schwarz inequality.
When you try to solve it, you...

Mar2712 05:50 AM
dodo

1 
768 
This seems a simple question but I can't find the solution by myself. Please help.
Say we have a 2 by 2 matrix with...

Mar2712 06:06 AM
Hassan2

2 
2,823 
He starts using the term 'reducible', as it came out of nowhere, from the page 162 of the text.
I know, roughly,...

Mar2712 04:49 PM
julypraise

2 
826 
I intend to use the Gershgorin Circle Theorem for estimating the eigenvalues of a real symmetric (n x n) matrix....

Mar2812 02:48 AM
onako

0 
1,052 