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

Feb2313 09:24 AM
micromass

1 
36,174 
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 
2,493 
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 
729 
So I was working through some problems in Herstein's Algebra on my own time, and I came across something I wasn't so...

Nov1512 11:00 PM
mathwonk

8 
2,303 
Let k\in\mathbb{N}, and q be a prime factor of F_{k}=2^{2^{k}}+1.
Deduce that gcd(q1,2^{k+1})=2^{k+1}.
...

Nov1512 11:49 AM
TaliskerBA

1 
1,603 
Hi all,
I have a linear algebra question relating actually to control systems (applied differential equations)
...

Nov1612 09:07 AM
X89codered89X

1 
822 
I'm doing my senior project about Compressed sensing, I have some problems with some algorithms.
1)Can any body help...

Nov1612 09:14 AM
giaoduong

1 
830 
Hello,
Would it be correct to say that if for every two different vectors x and y, A*x ≠ A*y (where A is a...

Nov1612 03:57 PM
AlephZero

8 
1,167 
I have created a program in javascript that has tested integers on the collatz conjecture.
Recall that the collatz...

Nov1712 12:26 PM
phillip1882

1 
1,973 
hi ,
I met lot's of binary operation which is associative and commtative and I also met lot's of binary operation...

Nov1912 07:10 AM
Dead Boss

5 
1,195 
Hi!
I just need a "yes" or "no" answer.
If i have to show that two lie algebras are isomorphic,
is it...

Nov1812 06:54 AM
parton

2 
807 
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 
1,636 
I have this problem:
1. θ is 0, θ1]T and θreplicated = 0, θ0, θ1, θ1]T, further θ is a gaussian with mean mθ and...

Nov1812 05:31 AM
quantumlight

0 
635 
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 
1,844 
In your opinion. Or feel free to quote some people on their views of the answer.

Nov1812 07:56 PM
micromass

17 
3,437 
I am curious about under what conditions the powers of a square matrix can equal the identity matrix.
Suppose that...

Nov1912 01:26 AM
Norwegian

3 
1,242 
For any A \in \mathcal{R}^{n \times m}, does A^T A have an inverse?
From the wikipedia article for transpose (...

Nov1912 12:09 PM
D H

5 
916 
Hello,
This is not a homework exercise, so I decided to post it here. Hopefully one of you could help.
I would like...

Nov1912 03:03 PM
micromass

1 
886 
Hi
We have a matrix A (picture), the eigenvalues are λ1 = 4 and λ2 = 1 and the eigenvectors are
λ1 :...

Nov1912 04:05 PM
AlephZero

7 
1,301 
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 
1,239 
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 
2,098 
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 
2,795 
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 
857 
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 
949 
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 
1,032 
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 
890 
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 
1,287 
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 
980 
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 
1,572 
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 
1,282 
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 
1,168 
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 
1,384 
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 
1,035 
Is there a nice closedform for this?

Nov2612 06:05 PM
ramsey2879

3 
1,936 
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 
1,628 
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 
1,020 
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 
1,821 
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 
1,009 
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 
705 
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 
1,679 
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 
818 