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

Feb2313 09:24 AM
micromass

1 
36,197 
Let x be in R^n and Q in Mat(R,n) where Q is hermitian and negative definite. Let (.,.) be the usual euclidian inner...

Jul1712 01:09 PM
micromass

1 
717 
Maybe someone will find something interesting in this paper. They have a reference to some 1995 work by Alain Connes....

Dec2510 03:26 AM
chiro

1 
1,703 
I recently got (re)interested in C* algebras. Poking around, I gathered that there is some way of constructing a C*...

Jan713 12:17 PM
marcus

0 
582 
This is my first post on the physicsforums so go easy on me :)
I am writing a simple program to generate the zero's...

Oct2909 04:38 AM
marcusmath

2 
3,103 
I apologize for my lack of knowledge on the topic.
I recently started writing programs to solve Project Euler...

Jun511 11:44 AM
marcuss421

7 
2,272 
After reading the article on Poincare's conjecture in the Economist, I became curious about simplified 3dimensional...

Sep2206 05:47 AM
mathwonk

3 
2,211 
First,could you please clear this doubt
A polynomial with rational coefficients does not form a vector space over...

Aug212 09:47 PM
homeomorphic

4 
1,404 
well this is the question... if a,m and n are positive integers with m<n, then (a^(2^m)+1) is a divisor of...

Oct2809 12:22 AM
Petek

1 
1,343 
can u help me with this question
If n ≥ 6 is a composite integer, then n (n − 1)! If n is a prime number, then n...

Oct2909 07:04 AM
Bingk

6 
1,328 
1. The problem statement, all variables and given/known data
Let F be a subfield of K. A, B be elements of Mn(F)....

Mar1311 11:39 PM
Maria00

0 
735 
In linear algebra, we are now learning about digraphs and I am somewhat confused as to how we can obtain and use...

Apr1808 03:45 PM
Marie11

2 
3,162 
Hi there!
I have to solve the following equation:
5x+6y = 40
and find out every pair (x,y) from Z that...

Nov908 01:01 PM
cup

17 
2,060 
Hi there!
I´ve come upon the following problem: I want to determine the set of all lines of the following surface:...

Nov108 03:56 PM
tinytim

3 
1,544 
Hi all!
The prof for "theoretical methods in physics" mentioned last week the term "wedge product" but it all...

Nov1308 11:42 PM
maze

5 
6,481 
Hi!
I want to determine which of the subgropus of the symmetric group S(3) are normal. The condition is:
for...

Nov908 01:05 PM
Marin

8 
1,875 
Hi there!
I need a little help from your side. Could you give me an example of a quadratic number in Z3
there is...

Nov1608 05:23 AM
HallsofIvy

2 
4,998 
Hi all!
I´m trying to prove following two inequalities but I somehow got stuck:
U, W are subspaces of V with...

Nov2108 05:33 PM
adriank

3 
1,465 
Hi all!
Does anyone know a general method for determining the image of a lin map?
I´m aware of the definition if...

Nov2408 08:50 AM
mathwonk

5 
3,745 
Hi all!
I want to determine to matrices, S and T, so that for the matrix B,
...

Dec708 02:09 PM
Marin

2 
1,980 
Hi all!
I was wondering what conditions must two linear maps obey in order to commute?
If they are described by...

Apr209 10:13 AM
eok20

4 
1,105 
Hi!
I was doing an assignment in quantum mechanics and came upon the following fact I cannot explain to me.
I...

Feb1510 12:06 PM
Marin

2 
1,029 
Hi there!
I'm trying to prove the following obvious statement, but am somehow stuck :(
Let \vec a,\ \vec...

May510 10:42 PM
Live2Learn

4 
1,916 
I have a trouble proving that a finate (nonzero) commutative ring with no zero divisors must have an identity with...

Oct2707 04:54 PM
morphism

1 
1,687 
please i need your help!
prove: "A nonempty set of real numbers bounded from below has a greatest lower bound."

Apr607 12:18 PM
adityab88

6 
5,430 
In sieve method, we could get the prime numbers between p and p^2 applying the primes less than prime number p.
Is...

May706 03:40 PM
shmoe

5 
1,645 
PROBLEM: For any number in any base at least 2 digits long, if you add them together and solve it the answer will...

May604 07:04 PM
Gokul43201

10 
2,033 
Hello everyone, I'm a bit of beginner to the more complicated algebra and geometry. Im going in to grade 12 next...

Aug3004 08:48 PM
cronxeh

4 
2,149 
What's an example of a group that has finitely many generators, but cannot be presented using only finitely many...

Sep412 09:54 PM
DonAntonio

1 
940 
Is there something you can do to a ring to produce a commutative ring? Like for any group, you can create an Abelian...

Nov210 08:09 AM
arkajad

5 
983 
For a commutative ring R and an ideal I, is it true that I \oplus R/I \cong R ? I know in some cases this is true, and...

Jan2611 05:52 PM
markiv

6 
2,572 
I came across this problem today and haven't been able to figure it out...
Give an example of a vector space V...

Jun1008 11:32 AM
morphism

5 
4,744 
Hi folks,
I know the covariance matrix and the location of a point, both of which are expressed in Cartesian...

Feb812 12:46 AM
Stephen Tashi

15 
2,352 
Could someone please help me with the following question with a guided step by step answer:
Show that T = (x, y, z)...

Sep412 08:53 AM
DonAntonio

1 
765 
HI, I was reading an article and it says that a finite group of order p^aq^b, where p, q are primes, is solvable and...

Jan2812 09:33 AM
MarkovMarakov

2 
1,573 
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 
1,011 
Hi everybody,
I'm new to absract algebra and I really can not understand different between direct sum and direct...

Mar1410 11:58 AM
Landau

9 
8,033 
Does anybody know how to create a orthonormal basis, i.e. a matrix containing orthogonal vectors of norm 1, out of a...

Apr2313 01:26 PM
markuz

2 
514 
Can anyone explain me the problem of the 36officers and the relation to finite fields ???
References to other...

Jul2604 10:36 PM
Hurkyl

3 
2,878 
If we're working in R^n and we consider the elements of a basis for R^n to be the column vectors of an nxn invertible...

Nov2611 07:40 PM
HallsofIvy

1 
1,633 
I've seen in multiple sources that a linear transformation constitutes a tensor with one contravariant and one...

Dec1011 09:31 PM
marschmellow

6 
2,092 