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

Feb2313 09:24 AM
micromass

1 
35,138 
Hi guys,
Let's say I have a 6x6 matrix A whose Jordan form J has 3 Jordan blocks. It means that this matrix (matrix...

Dec312 10:24 PM
fluidistic

18 
3,104 
How are orbits and cosets related? Are all orbits cosets? Are all cosets orbits? Also, what exactly are Gsets and...

Nov3012 10:09 AM
lavinia

1 
1,130 
Hello,
I want to find a family of functions \phi:\mathbb{R} \rightarrow \mathbb{C} that have the property:...

Nov2812 03:30 PM
lavinia

14 
1,759 
I thought it would be obvious, but I can't find a series representation of the Laplace transform. I'm looking for...

Nov2912 08:48 AM
lurflurf

2 
995 
I have two 3d applications and when an object(a cube for example) is transferred between them, the rotation values of...

Nov2812 08:06 AM
HallsofIvy

3 
801 
It's very difficult for me to find any simple literature to explain this idea.
J\inMn(ℂ) is a coninvolutory (or a...

Nov2912 01:42 PM
rasmhop

4 
914 
Hello,
let's suppose I have two functions f,g\in L^2(\mathbb{R}) and I consider the inner product \left\langle f,g...

Nov2912 06:54 PM
Stephen Tashi

7 
1,398 
Given two systems, Ax=b and Cy=d, for nxn matrices A and C, and ndimensional vectors b and d, each of which has at...

Dec112 12:21 PM
Erland

1 
889 
The following problem was given on a test of mine and I got it completely wrong. If anyone can help me with solving...

Nov2912 06:09 PM
jgens

1 
765 
After solving some problems about matrix invertibility and learning some theorems (and proving them), I have developed...

Dec112 01:22 PM
Bipolarity

2 
817 
Hi guys
I wonder if you know any linear algebra formalism or something to solve the following question...

Dec312 10:37 AM
phynewb

3 
996 
I now know that inverses are only defined for square matrices. My question is: is this because inverses for nonsquare...

Dec212 06:57 AM
HallsofIvy

8 
1,092 
let A_i be an odd integer, s_i be the square of a_i and t_i be the triangular number, (s_i 1)/8. Same for a_j , s_j,...

Dec112 10:25 PM
Norwegian

2 
1,375 
At first I thought that there is no square matrix whose square is the 0 matrix. But I found a counterexample to this....

Dec212 12:37 PM
Bipolarity

5 
1,080 
Bocard's problem asks to find the solutions to the Diophantine equation n!=m^21. The only known (n,m) pairs are...

Dec912 05:46 PM
Someone2841

3 
1,754 
I am trying to find a way to generate solutions to 5b^2*c^2 = 4a^2(b^2+c^2)
Can anyone offer some insight?
I...

Dec1312 06:26 AM
ramsey2879

55 
7,188 
the question is , if f(n)= 1+10+10^2 +... + 10^n , where n is integer.
find the least n s.t. f(n) is divisible by 17...

Dec512 09:33 AM
Edgardo

3 
1,301 
Hi,
If A is some nonsquare matrix that is possible rankdeficient, then am I right to understand that (A^T)(A) is a...

Dec512 09:16 AM
D H

1 
1,791 
Hi. There is a polynomial f = (x^3) + 2(x^2) + 1, f belongs to Q. It will be shown that the polynomial is irreducible...

Dec512 06:36 PM
Square1

1 
744 
I am curious about the proof of the fact that the value of a determinant computed using the Laplace (or cofactor)...

Dec612 12:09 PM
micromass

1 
692 
I need some help understanding the following definition:
Definition: Let A\inMn(ℂ) the complex vector space
...

Dec812 09:11 PM
BrainHurts

4 
823 
Hi
Can anyone help with understand a basic idea, I have a matrix A in MATLAB which is 100x3000.
I have checked...

Dec612 08:04 AM
mikeph

2 
708 
If I have a matrix valued function A(x) of some scalar x, how do I compute the derivative of the square root of A with...

Dec912 09:35 PM
bpet

4 
1,834 
3.5036799918564934004113
I need help identifying this real number. The closest I have gotten is e+pi/4.
But I...

Dec912 11:53 PM
haruspex

9 
1,925 
I recall a post previously where the Op was wondering if any circle about the orgin having an irrational radius could...

Dec812 09:43 PM
ramsey2879

4 
1,356 
I'm not a mathematician of any sort so excuse me if my question is stupid.
I just realized that I could not define...

Dec1012 10:52 PM
jedishrfu

3 
1,429 
on page 261 of this paper by J. Vermeer (http://www.math.technion.ac.il/iic/e..._pp258283.pdf) he writes
The...

Dec912 09:38 PM
BrainHurts

4 
819 
Is anyone interested in learning some algebra? I was planning to go through Dummit and Foote (I have some basic group...

Dec912 01:56 AM
sammycaps

0 
660 
The proof goes as follows:
For contradiction, assume there exists s< ∞ such that s = {e1, e2, ... , en} and...

Dec1112 07:51 AM
mfb

1 
561 
Ok I promise this time it is not a homework type question.
If someone could direct with a name of a theorem here,...

Dec1212 08:54 PM
Square1

3 
762 
I've been reading a few mathematical definitions and I'm still not sure I grasp their significance. If Ax = b, then...

Dec1312 04:42 AM
mikeph

9 
1,413 
I'm still confused about L U matrix factorization. I'm trying to understand how to do it and why doing so is...

Dec1112 03:00 PM
symbolipoint

4 
1,027 
Hi All,
I've been following a group theory course which I am struggling with at the moment. I'm from 3 different...

Dec1112 07:36 AM
AlbertEi

4 
863 
Hey! I am studying group theory for particle physicists right now and I came across the following general question...

Dec1112 01:24 AM
CuriosusNN

0 
639 
So this is a pretty dumb question, but I'm just trying to understand homomorphisms of infinite cyclic groups.
I...

Dec1412 09:34 AM
sammycaps

10 
1,239 
I am not sure which rubric this belongs to, but since the zeta function is involved, I am putting it here.
I noticed...

Dec1212 11:15 PM
nomadreid

0 
1,122 
Can someone please explain to me, in as simple words as possible, what a quotient group is???? I hate my books...

Dec1312 08:05 PM
algebrat

2 
744 
A 3x3 symmetric matrix has a null space of dimension one containing the vector (1,1,1). Find the bases and dimensions...

Dec1412 01:21 AM
MoBaT

3 
621 
Hi guys,
I am not a physicist but saw that you guys are actively discussing math problems in this forum. I have the...

Dec1412 04:34 PM
chiro

1 
709 
Suppose we have a dynamical system x_{t+1} = Ax_{t} where A is matrix, x is vector. We suppose that $x$ always grow as...

Dec1512 08:29 AM
pasmith

1 
683 