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Linear & Abstract Algebra

- Vector spaces and linear transformations. Groups and other algebraic structures along with Number Theory.
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Jan16-12 Greg Bernhardt
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:24 AM
micromass
1 35,751
A little while ago I noticed a pattern in the sums of the digits of perfect squares that seems to suggest that: For...
Apr12-04 08:55 PM
honestrosewater
25 7,431
My lack of any shred of idea about the concept of the determinant is really beginning to bug me. Especially now that I...
Sep20-10 12:09 PM
mathwonk
23 7,397
I am a member of the Dozenal Society of Great Britain ( www.dsgb.orbix.co.uk ) . We maintain that base twelve is...
Jan14-10 03:17 PM
HallsofIvy
34 7,396
I'm working on a skeletal animation system, and I want to interpolate the rotations between frames. The rotations are...
Jan27-05 04:42 PM
BobG
2 7,394
About 20 years ago I caught an article about a graduate student who had found an algoritm which would return the n-th...
Sep27-06 07:55 PM
Mothershed
14 7,381
Hi, This is the problem: Lorraine has $7.70 in dimes and quarters. If the number of quarters is two more than twice...
Apr30-05 10:30 PM
dajohu
2 7,379
Can isomorphism of matrix groups \phi: G_1 \rightarrow G_2 always be expressed by \phi(M) = S M S^{-1}?
Jul25-08 03:43 AM
cathalcummins
16 7,368
I have to prove that if ab is divisible by the prime p, and a is not divisible by p, then b is divisible by p. In...
Aug6-04 08:10 AM
HallsofIvy
9 7,359
Can someone guide me through the proof (or point me to where I can find the proof) that the group of rational numbers...
Apr29-04 12:46 PM
NateTG
7 7,354
How to find detA if A is 4x4 matrix or more than 4x4.
Oct29-10 12:01 AM
mathwonk
7 7,335
hello all after doing a bit of research on the riemann hypothesis I came along this paragraph, in which I dont...
Dec10-10 01:37 PM
change257
16 7,317
Investigating the Diophantine equation q = \frac{n^2+1}{p}} where {p} is a prime number, n,q are integers per...
May18-05 07:56 AM
AntonVrba
5 7,312
Hi, I have been searching the web for this subject to see if the formula I stumbled on is out there. This site...
Jun13-08 05:58 AM
jim mcnamara
1 7,308
I am reading (theorem 2.14) from a textbook, and don't understand how g = Tf and (#1) line of reasoning. The theorem...
Oct19-09 11:08 AM
viviane363
9 7,306
I've done 3 of my 5 problems, which took me 2 days and over 30-50 pieces of scrap paper. I'm serious, I didn't even...
Oct5-05 12:16 AM
ramsey2879
6 7,288
I am trying to find a way to generate solutions to 5b^2*c^2 = 4a^2(b^2+c^2) Can anyone offer some insight? I...
Dec13-12 06:26 AM
ramsey2879
55 7,283
Greetings, I just stumbled upon this site and thought someone might be able to help me. How many elements of order 5...
Oct6-04 11:22 AM
Motifs
2 7,261
I have this matrix problem: Given R_1, R_2, R_3\in\mathbb{R}^{N\times N} are symmetric matrices with rank p<N....
May23-06 07:36 AM
doodle
1 7,259
Hello, can anyone tell me if I understand this right? :rolleyes: I have a t-invariant subspace with basis B,...
Feb14-07 11:08 AM
matt grime
3 7,257
Q: If A is an m x n matrix and rank A = m, show that m <= n. I know that by definition if A is m x n, then rank A...
Jul13-05 10:46 PM
mathwonk
9 7,252
I mean, according to my knowledge, Bertrand's postulate has already been proved, I've already read and understood one,...
Apr30-10 04:11 AM
astroultraman
20 7,246
I'm looking at the exercises of Hungerfod's Algebra. Some looks easy but it seems the proofs are not so obvious....
Nov11-09 12:27 AM
Spartan Math
4 7,244
I need to find the inverse of a 2x2 matrix of the form I'm halfway there, but the algebra gets really messy. ...
Sep24-08 09:51 PM
Defennder
3 7,241
Cantor's diagonal slash has been used to argue that the infinity of reals is uncountable, whereas the infinity of...
Mar7-05 05:23 AM
Hurkyl
44 7,227
hmm.........
Sep30-11 05:47 PM
lostcauses10x
19 7,222
Quick question: is the nullspace the orthogonal complement of the column space or the the row space? Thanks, sorry...
Nov22-04 05:21 AM
Galileo
2 7,211
Just a conjecture... If any realizable real is built from the integers, then the single smallest positive real is:...
Jun21-04 01:22 AM
Jack Martinelli
16 7,183
Does anybody know of any jobs that deal explicitly with Matrices and/or Linear Algebra? I have to do a paper and I...
Oct19-07 12:43 PM
chapani
2 7,177
Claim: n! + 1 and (n+1)! + 1 are relatively prime. How can we prove this? Can we use mathematical induction? Base...
Jan14-10 01:09 AM
Ivan,Cow'sSon
45 7,160
write all possible equivalent conditions to "A is invertible," where A is an nxn matrix.
Nov7-07 07:55 PM
morphism
7 7,154
A function f between groups is said to be a homomorphism if it "preserves" the product in the sense that...
Aug2-10 05:58 AM
Fredrik
52 7,142
I'm working on some basic number theory. I came across an idea and I'm having trouble finding a general solution. A...
Jun28-07 11:08 AM
ramsey2879
3 7,131
If you have two groups, G_1 and G_2 and A is a common subgroup, then you can form the free product of G_1 and G_2...
Oct25-06 10:30 PM
mathwonk
20 7,107
0^0 = 1? ( 1 2 3 ... Last)
I've been told that any number raised to the zeroeth power is equal to 1. What about zero raised to the zeroeth...
May29-05 09:06 AM
matt grime
83 7,106
The question: If G is the additive group Q/Z, what are the elements of the subgroup G(2)? Of G(P) for any positive...
Sep12-08 01:50 AM
morphism
1 7,093
I have a few questions to ask. They are simple, but the purpose is to make sure I'm staying on track. First, the...
Jan26-06 05:20 PM
JasonRox
44 7,089
How would I calculate the determinant of a square matrix using LU Decomposition. Please be plain, I am not good with...
Aug20-09 10:11 PM
jeff1evesque
1 7,071
What do you guys think of this? I haven't been able to find any sort of verification from reputable sites. "Edgar...
Oct6-06 12:08 PM
arildno
20 7,062
So I've shown that A and A^T have the same char. polynomials => same eigenvalues, using the fact that detA = detA^T. ...
Feb15-08 04:19 PM
ObsessiveMathsFreak
2 7,062
Hi I don't understand why only a matrix full of zero has a rank = 0. "the rank of a matrix A is the number of...
Mar27-11 12:32 PM
eg0
5 7,046

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