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

Feb2313 09:24 AM
micromass

1 
35,885 
If we consider a number 9999999………. infinite times then no other number that can be represented bigger than that...

Nov2412 08:04 PM
schtruklyn

9 
2,470 
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 
3,181 
Hi,
http://www.staff.science.uu.nl/~ban00101/lecnotes/lieder.pdf
I just need help understanding one line of the...

Nov2612 01:20 PM
supaman5

0 
722 
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 
1,152 
Hey, here's a simple question.
I have been reading some materials and, for the nth time in my life, there was a...

Nov2012 11:19 AM
micromass

15 
1,625 
let P(n) = n^4 + an^3 + bn^2 + cn
M(a,b,c) returns largest m that divides P(n) for all n
then let function S(N)...

Nov2112 07:32 AM
coolul007

2 
1,826 
This is not a homework question .....
If two vector spaces, say V and W, have equal cardinality V=W .... do...

Nov2112 07:41 PM
Erland

2 
1,231 
It is defined that for any matrix A, A^{0} is defined as being equal to the identity matrix, I
My question: Does...

Nov2112 05:32 PM
micromass

18 
2,056 
Matrix A=
2 1 2
1 2 2
2 2 1
It's known that it has eigenvalues d1=3, d2=d3=3
Because it has 3...

Nov2212 02:16 PM
aija

6 
2,763 
I have Theorem 1 from a research paper.
Theorem 1. Suppose that G is a finite nonabelian simple group. Then there...

Nov2012 01:04 PM
moont14263

0 
851 
Why is that Nullspace of A is subset of nullspace of A^T*A
let's say that A is m*n matrix

Nov2012 09:54 PM
iamzzz

2 
939 
if A is a tridiagonal Matrix , what does this mean ?
what does tridiagonal mean in matrix ?
what is the property...

Nov2212 11:40 AM
HallsofIvy

2 
1,009 
How do you find matrices a,b,c satisfying
a=b*c*b^1
b=c*a*c^1
c=a*b*a^1 ?

Nov2212 03:33 AM
Norwegian

2 
879 
If I have (for simplicity) a vector ( A, B) where A and B are matrices how does the transpose of this look, is it (...

Nov2112 06:14 PM
robotsheep

6 
1,247 
I have a vector (1,i) and need to normalize it. I am being told that the answer is 1/(sqrt(2)) (1,i) but it seems...

Nov2412 05:21 AM
Fredrik

3 
972 
Ok there is no way I am writing out all the work of this question using a keyboard, and my scanner chose today not to...

Nov2512 06:33 PM
pierce15

4 
1,553 
I have solved the roots of a quadratic equation and want to "test" them by putting them back in for x. I am having a...

Nov2312 08:30 PM
Square1

5 
1,267 
Hi. In Apostol's book "Introduction to analytic number theory", Teorem 3.2(b), Apostol proves
(1)
\zeta (s) =...

Nov2412 08:11 PM
schtruklyn

1 
1,161 
Hey!
Let M and N be two natural numbers and N>M. I want to build a set A with N vectors of size M such that each...

Nov2712 08:37 AM
HallsofIvy

2 
1,375 
Hi,
if we suppose x and y are two elements of some vector space V (say ℝn), and if we consider a linear function...

Nov2712 12:01 PM
mnb96

2 
1,024 
Is there a nice closedform for this?

Nov2612 06:05 PM
ramsey2879

3 
1,903 
wrtie down the possible isomorphism types of abelian groups of orders 74 and 800
then for 74=2*37 then Z(74) is...

Nov2512 06:09 PM
cummings12332

2 
1,606 
Linear transformation f:C^∞(R) > C^∞(R)
f(x(t)) = x'(t)
a) I have to set up the eigenvalueproblem and...

Nov2712 08:16 PM
HallsofIvy

2 
1,011 
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 
1,800 
I am having trouble understanding a section in these notes: . It is on page 3. Section 3  Discretization of the...

Nov2512 07:07 PM
MarkovMarakov

0 
999 
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 
1,034 
Sorry about the long title. I recently had a few homework problems which were similar to the title of the post. I...

Nov2712 02:46 PM
Szichedelic

1 
702 
Ok I understand the concept of infinite countability and that say the set of all rational #s is infinitely countable,...

Nov2712 05:43 PM
Mark44

1 
1,664 
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 
813 
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 
927 
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 
1,421 
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 
900 
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 
788 
After solving some problems about matrix invertibility and learning some theorems (and proving them), I have developed...

Dec112 01:22 PM
Bipolarity

2 
826 
Hi guys
I wonder if you know any linear algebra formalism or something to solve the following question...

Dec312 10:37 AM
phynewb

3 
1,012 
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 
1,115 
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 
1,402 
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 
1,099 
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 
1,332 
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 
1,844 