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

Feb2313 09:24 AM
micromass

1 
36,262 
Let's say I have a vector (4+2i, 1i), how do I take an L2 norm?
Dont tell me I simply do sqrt(16+4+1+1)..?

Jan2713 12:21 AM
jbunniii

1 
1,057 
Greetings.
I am new to the forums. I will try and keep this short.
Linear Independence vs Linear Dependence....

Jan2613 02:03 PM
Gipson

38 
2,970 
Hi.
I'm trying to determine the CFL condition for the fourthorder leapfrog scheme. I'm finding 2 as what's...

Jan2613 01:15 PM
wrechtin

4 
1,636 
When the book says "Members of ] are linear combinations of linear combinations of members of S". basically means the...

Jan2613 10:56 AM
Fredrik

3 
890 
Hi, I'm learning about vector spaces and I would like to ask some questions about it.
Suppose I have a vector space...

Jan2513 04:57 PM
lavinia

5 
1,048 
Hello, :)
I would like to minimize and find the zeros of the function F(S,P)=trace(SSP’(A+ PSP’)^1PS) in respect...

Jan2513 06:04 AM
GoodSpirit

3 
880 
hey guys so i am well familiar with finding out rank of square matrices but if matrix is just a row or column vector...

Jan2413 01:21 PM
shivaniits

9 
1,133 
a = xyz
b = xy+xz+yz
c = x + y + z
How do you solve x, y, and z?

Jan2313 04:46 PM
mfb

3 
1,057 
In the book it states that the span of the empty set is the trivial set because a linear combination of no vectors is...

Jan2313 07:24 AM
HallsofIvy

3 
1,072 
The question is which sets of natural numbers are closed under addition. I know that odd is not, and I know how to...

Jan2313 03:23 AM
lurflurf

2 
934 
Hi all. I have a question about the properties of the generators of the SO(N) group.
What kind of commutation...

Jan2213 01:44 AM
Einj

3 
998 
From my textbook:
A free Rmodule is "A left Rmodule F is called a free left Rmodule if F is isomorphic to a...

Jan2113 02:51 AM
algebrat

1 
1,085 
Hi all,
I searched all other threads but was unable to find something useful. Here is my question: I am looking...

Jan2013 03:06 PM
Wrukproek

0 
695 
Prove the Generalized Associative Law for Groups (i.e. a finite sum of elements can be bracketed in any way).
The...

Jan2013 12:55 PM
Fredrik

6 
1,698 
A Theorem in our textbook says...
If R is a PID, then every finitely generated torision Rmodule M is a direct sum...

Jan1813 03:00 PM
mathwonk

1 
999 
Dear Friends & Colleagues,
I have a couple of nagging issues with mathematics I was hoping any one of you would...

Jan1813 10:42 AM
Stephen Tashi

5 
2,370 
Following is a list of 39 Mersenne numbers. Some are prime and some are not. These are generated with x =(...

Jan1713 08:06 AM
arydberg

6 
1,405 
hey guys
given Ax=B where A is a square matrix and x and B are vectors, can anyone tell me why a singular matrix...

Jan1613 08:38 PM
joshmccraney

3 
1,105 
I was thinking about the following proposition that I think should be true, but I can't pove:
Suppose that F is a...

Jan1613 05:59 AM
lavinia

2 
1,000 
Hi,
For any odd composite 'N', let u = (N1)/2, v = u+1, then u^2(mod p) = v^2(mod p) if and only if 'p' is a...

Jan1613 02:49 AM
dodo

1 
982 
My textbook says that...
If M is a left Rmodule, then a submodule N of M...is an additive subgoup N of M closed...

Jan1513 09:33 PM
mathwonk

3 
812 
I'm unable to understand this generalization of vectors from a quality having a magnitude and direction, to the more...

Jan1413 10:29 AM
danzibr

4 
1,443 
In this video:
http://www.youtube.com/watch?v=FZzQKBlpE
At the time 2:10, I don't understand why we have to...

Jan1413 07:15 AM
Artusartos

4 
1,113 
Perhaps forum members can advance science by solving this optimization problem from The Protein Engineer ...

Jan1313 04:10 PM
homeomorphic

2 
886 
I don't know if this is the correct section to post this, but does Galois theory has any applications in physics?

Jan1313 03:47 AM
Jim Kata

2 
2,054 
Pretty much what the title says.
Suppose we have a topological vector space $(X,\tau)$ and $U\subseteq X$ is...

Jan1213 09:32 AM
danzibr

5 
1,317 
Hi all,
I have been asked the question by a friend of mine who was working on a computer algorithm where he needed...

Jan1113 03:01 PM
HallsofIvy

4 
1,305 
Hello all,
I am new to this forum but am glad I found it, I have a quick question about condition numbers and order...

Jan1013 06:08 PM
AlephZero

5 
1,254 
Hello,
I was wondering if this problem is one that is solvable, and if so, if I would be able to solve it in a...

Jan913 11:31 PM
hello95

3 
1,117 
Hey guys, lurked here a bit, but now I'm in this new math course right. So anyway it seems like a completely new...

Jan913 06:59 PM
sniper_spike

4 
860 
Hi guys, first post!
I'm doing some side work on coupled oscillating systems, and I've almost found a procedure to...

Jan913 03:39 PM
Jack Jenkins

0 
932 
Hi,
Let the linear system Ax=b.
I am looking for literature describing how changes on coefficients matrix A affect...

Jan813 05:01 PM
yiorgos

0 
630 
I'm trying to understand the derivation of polynomial regression.
Given data points: . So a 2nd degree curve will...

Jan813 02:58 PM
SteamKing

10 
1,265 
I have a question about the proof that I attached...
1) Since R/I is not the zero ring, we know that 1 \not= 0....

Jan713 09:01 PM
Number Nine

1 
854 
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 
Hi
I am going through Sheldon Axler  Linear Algebra Done right. The book States the Complex Spectral Theorem as :...

Jan713 11:38 AM
vish_maths

4 
1,174 
No not the trival solution but generally GCD(x,y) = 1 when GCD(A,B)=1
x =...

Jan713 12:40 AM
ramsey2879

0 
1,021 
Hello everyone!
I'm a 1st grade student in a slovenian high school. Recently, I've became very intrested in numbers...

Jan613 09:22 PM
skiller

11 
2,386 
I have some technical questions about spans and bases which my textbook really does not cover very well. I would...

Jan613 06:16 PM
AlephZero

2 
934 
I have no idea what this is! Please can someone explain comparing to a 3x3 matrix?

Jan613 05:19 PM
mfb

3 
1,120 