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

Feb2313 09:24 AM
micromass

1 
36,230 
Is the derivative operator d/dx bounded with respect to the norm <f,g> defined by
integral from 0 to 1 of f g*...

Nov1409 01:01 PM
esisk

2 
1,313 
hi can someone tell me...how to correctly use the 10 axioms..
for example: does the set of all 3x3 symmetric matrices...

Nov1409 04:11 AM
HallsofIvy

3 
2,637 
I'm going to be doing research next semester on a topic of almost entirely my choice. I'd like to research anything...

Nov1309 03:07 PM
Newtime

3 
1,678 
First, sorry for my poor English and any impolite behavior might happen.
Here's two wave function(pic1) and problem...

Nov1309 07:56 AM
boladore

0 
2,903 
I'm trying to show that a set W of polynomials in P2 such that p(1)=0 is a subspace of P2. Then find a basis for W...

Nov1309 06:00 AM
HallsofIvy

11 
4,777 
The question posed is "Classify up to similarity all 3 x 3 complex matrices A s.t. A^{3} = I. I think the biggest...

Nov1109 09:17 AM
g_edgar

4 
2,537 
Hi,
I've been trying to show that the set of matrices that preserve L1 norm (sum of absolute values of each...

Nov1109 09:11 AM
g_edgar

5 
3,307 
I'm looking at the exercises of Hungerfod's Algebra. Some looks easy but it seems the proofs are not so obvious....

Nov1109 12:27 AM
Spartan Math

4 
7,282 
i)]+1=0 :I had a friend with a Tshirt displaying this deceptively simple equation. I know it to be true, but I have...

Nov1009 06:23 AM
widewombat

51 
23,597 
can explain to me what is mean of span?
from book, it say "every vector in the space can be expressed as linear...

Nov1009 01:02 AM
Dafe

6 
1,611 
If I have a matrix A, and I use n different row operations of this form: a_kR_i + R_j \rightarrow R_i to construct a...

Nov909 08:01 PM
slider142

5 
1,040 
The positive powers of 2 mod 5^m cycle with period 4*5^(m1), which you can prove by showing that 2 is a primitive...

Nov909 10:59 AM
DoctorBinary

8 
5,255 
Let E = span{v1, v2} be the linear subspace of R3 spanned by the vectors v1 = (0,1,2) and v2 = (1, 1, 1). Find...

Nov809 09:12 PM
epkid08

8 
3,341 
Suppose that a casino introduces a game in which a player bets $1 and can
either win $2 or lose it, both with equal...

Nov809 02:39 AM
ha9981

0 
2,078 
I am working on some homework that I already handed in, but I cant get one of the problems. The fourth problem on the...

Nov709 11:46 AM
prez

3 
6,010 
Hi,
I am trying to verify with anybody generally intrigued by the Riemann Hypothesis whether they might find of any...

Nov709 05:14 AM
Luca

0 
1,355 
Let's say I have a matrix A:
A=\begin{bmatrix}
f(x)& z_1(x)& z_2(x)\\
0& a(x)& b(x)\\
0& c(x)& d(x) ...

Nov609 09:24 PM
HallsofIvy

9 
1,195 
I did a problem in class today that evaluated f(t)=e^{At} for A_{2,2}=\begin{bmatrix}2&1 \\1&4 \end{bmatrix} to a...

Nov609 04:30 PM
tinytim

1 
880 
right now, my concept for their difference is that linear transformations are 1 to 1, where as nonlinear...

Nov509 04:04 AM
HallsofIvy

2 
10,313 
I had a question about the following theorem.
Basis Representation Theorem: Let k be any integer larger than 1. ...

Nov509 02:12 AM
ppd

3 
6,418 
Suppose A is a finite abelian group and p is a prime. A^p={a^p : a in A} and A_p={x:x^p=1,x in A}.
How to show A/A^p...

Nov409 04:33 PM
ilia1987

1 
2,248 
Hi, I'm applying the Lanczos algorithm to find the minimal eigenvalue of some huge matrix. Now that I've got it I'm...

Nov309 01:06 PM
maverick_starstrider

0 
1,890 
What would be a formula for determining an estimate of a track runner's speed in comparison to other racers before...

Nov309 12:16 PM
bobbobwhite

0 
618 
For example,
if alpha = 1, there is an unqiue solution.
then what value(s) of alpha will make the system...

Nov309 09:05 AM
ZannX

2 
5,543 
I have a system of linear equations which can be expressed as XA=Y where X and Y are row vectors. The vector Y and the...

Nov309 08:42 AM
ZannX

5 
2,310 
Hi all,
so I was looking at Legendre symbols, and I saw that \left(\frac{2}{p}\right)=(1)^{\frac{p^21}{8}}.
...

Nov309 02:23 AM
thomas430

5 
3,065 
Hi all
I am looking for a way of estimating stress and displacement of the following frame. I used ANSYS to analyze...

Nov209 12:51 PM
srosendal

0 
5,818 
Im trying to prove N(N(P)) = N(P)
So N(P) = set oh h where h^1Ph = p
Then N(N(P)) = k where k^1hk = h
the...

Nov209 11:18 AM
Niall101

4 
1,909 
Let the vectors a1,a2,a3 €R3 and b1,b2,b3 € R4 be given by
a1 a2 a3
1 2 3
2 2 1 ...

Nov209 05:28 AM
orange12

3 
919 
given the function Z(s)= \prod _{k=0}^{\infty}\zeta (s+k) with \zeta (s) being the Riemann Zeta function
the...

Nov109 06:08 PM
Petek

3 
2,036 
Hey. Got some troubles with this.
4 1 11
A= 1 3 11
0 2 6 ...

Nov109 05:08 PM
orange12

3 
1,041 
First off I am NOT asking you to solve this for me. I'm just trying to understand the concept behind this problem.
...

Oct3109 05:35 PM
HallsofIvy

14 
2,429 
I have been working on integer factorization with pq = n and have written a paper on the special case for q < 2p. I...

Oct3109 06:10 AM
mgb777

0 
1,298 
Let A_i (i=1,...,k) be a nonsingular complex matrix which size is M by M.
The question is how to find a complex...

Oct3109 03:11 AM
HallsofIvy

1 
1,014 
There are square pyramidal numbers and tetrahedral numbers, defined
Square pyramidal numbers = n ( n + 1 )( 2 n +...

Oct3009 01:52 PM
CRGreathouse

6 
4,206 
Hi,
I'm not sure to which forum my question related.
Is there a connection between models used in mathematics of...

Oct3009 10:59 AM
yaron123

0 
2,659 
Hi,
For a given problem, A*X = B where A is a NxN matrix, X and B are Nx1 accordingly, I understand that a poor...

Oct2909 01:12 PM
ZannX

0 
1,718 
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 
1,329 
Hello,
If we are given that b3a2, how do we show that ba?
I started off looking at prime factorizations, but I...

Oct2909 06:41 AM
Bingk

6 
1,331 
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 
3,108 