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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 35,153
Moved: anumericality
- - -
While studying Yang-Mills theory, I've come across the statement that there exists a positive-definite inner product...
Y 11:23 AM
Terandol
1 123
There are two "formal" definitions of vectors (and tensors in general) which I've learned. The first is what I...
Jul30-14 06:09 PM
micromass
15 230
Hi PF! Can you please tell me why it is beneficial to use SVD in data processing? My understanding is, given a lot...
Jul30-14 01:54 PM
Stephen Tashi
10 270
Hi, 2-forms are defined as du^{j} \wedge du^{k}(v,w) = v^{j}w^{k}-v^{k}w^{j} = \begin{vmatrix} du^{j}(v) &...
Jul30-14 09:34 AM
JonnyMaddox
0 85
Hello. I need some help. I am not a math wizard by any means, but I find myself in need of math right now. I have...
Jul30-14 07:58 AM
Erland
15 508
The killing form can be defined as the two-form ##K(X,Y) = \text{Tr} ad(X) \circ ad(Y)## and it has matrix components...
Jul29-14 01:19 PM
center o bass
0 84
In my limited study of abstract Lie groups, I have come across the adjoint representation ##Ad: G \to...
Jul29-14 01:46 AM
WWGD
1 335
(I don't like the title, since it is a bit misleading. But, I couldn't think of a more descriptive title that fit in...
Jul28-14 01:01 PM
Nick O
0 95
Hello, I am trying to understand the slides in the PDF I posted. I am looking particularly at slides 20-24. I am so...
Jul27-14 05:57 PM
AlephZero
13 572
Hi, all. I'm in desperate need of assistance with a matrix I can't get my head around of. I want to solve a system of...
Jul26-14 04:32 PM
skujesco2014
1 360
This should be really easy, but I can't seem to find the answer. What does the symbol ##\ominus## mean in the context...
Jul26-14 06:45 AM
HallsofIvy
2 359
Hi, I have a rather trivial question but google did not really help me. So far I was always familiar with the fact...
Jul24-14 11:23 PM
divB
5 596
I heard about fast tridiagonal matrix algorithm. I tried to find what is it but I can only find tridiagonal matrix...
Jul23-14 11:58 AM
Shyan
0 466
Just one simple doubt here. Can we use different scales on the x and y axes be used for denoting linear...
Jul22-14 06:48 AM
HallsofIvy
2 832
I know it should be absolute zero, but in a scientific calculator, which is an app actually, its value is shown...
Jul21-14 05:34 AM
Adit
3 500
Hello, I am going over these slides and I am very confused on a couple parts. First of all on the first slide, I...
Jul20-14 01:19 PM
WWGD
6 590
Hello everyone! I've been learning some basic group theory (I'm new to the subject). And I had a (hopefully) fairly...
Jul19-14 06:37 PM
WWGD
3 576
Hi,let: 0->A-> B -> 0 ; A,B Z-modules, be a short exact sequence. It follows A is isomorphic with B. . We...
Jul19-14 03:16 PM
WWGD
4 1,461
Problem 1: Use Gaussian elimination with back substitution to solve the following system. Problem 2: Use the...
Jul19-14 12:38 PM
micromass
6 957
Hi, Given several vectors, which may be or not be orthogonal to each other, how to construct a vector perpendicular...
Jul18-14 06:25 PM
WWGD
4 747
I am working with polytopes that are defined by half-planes in \Re^N. So they are defined by a number of inequalities...
Jul18-14 04:11 PM
sloppyintuit
2 710
Hi All, Let A,B be algebraic structures and let h A-->B be a bijective homomorphism. Is h an isomorphism? In...
Jul18-14 12:01 PM
WWGD
2 897
Use Gaussian elimination with back substitution to solve the following system: x1+x2+x3=1, x1+2x2+2x3=1,...
Jul17-14 09:34 PM
Math10
3 1,066
Hello, Been a long time lurker, but first time poster. I hope I can be very thorough and descriptive. So, I have...
Jul16-14 04:02 AM
nikphd
4 1,454
Hi all, Suppose I have a matrix A_{N\times N}. I compute its eigenmodes A V = V \Lambda. V, \Lambda are...
Jul15-14 08:06 PM
AlephZero
1 1,182
The killing form on a lie algebra is defined as $$B(X,Y) = \text{Tr}ad_X \circ ad_Y$$ where ##ad_X: \mathfrak{g} \to...
Jul14-14 05:44 PM
Terandol
1 1,481
Hello, Given the complex linear mapping: T(z) = Az + B where A is real and B is complex. However trying to show...
Jul14-14 03:57 PM
WWGD
3 1,197
The definition (taken from Robert Gilmore's: Lie groups, Lie algebras, and some of their applications): We have...
Jul14-14 01:22 PM
Travis091
6 1,370
Two groups are isomorphic if they has same number of elements and if they has same number of elements of same order?...
Jul5-14 05:24 PM
NeoAkaTheOne
12 5,677
Can you guys give me a concrete example of a completely positive map from M_m → M_n?
Jul3-14 06:26 PM
WWGD
2 2,456
Hi, i was wondering how the following expression can be decomposed: Let A=BC, where B, C are rectangular random...
Jul2-14 04:54 PM
MisterX
2 2,524
I am trying to diagonalize the following matrix: M = \left( \begin{array}{cccc} 0 & 0 & 0 & a \\ 0 & 0 & -a &...
Jul2-14 12:45 PM
Trifis
2 1,983
I need help solving for t in the following equation, |P + Vt + A(t^2)/2| = st where P V and A are vectors and s...
Jun30-14 04:45 PM
jedishrfu
3 2,250
I've been reading about algebraic geometry lately. I see that a lot of authors use ##V^\vee## to denote the dual space...
Jun29-14 10:45 AM
Mandelbroth
2 2,693
Hi. In this development (c ∇+ d A)(c ∇+dA)= c^{2} ∇^{2} + d^{2}A^{2} + cd A∇ + cd ∇A (c ∇+ d A)^{2}= c^{2} ∇^{2}...
Jun28-14 11:49 AM
Fredrik
9 2,126
Hi, Can someone explain me the division operation in the picture. First for left division we use (.\ ) not only ( \ )...
Jun26-14 06:22 PM
HallsofIvy
4 2,084
I was reading in my textbook that the scalar product of two complex vectors is also complex (I assuming this is true...
Jun23-14 08:16 AM
Fredrik
4 1,984
Hello, first of all, sorry if my question is either trivial or imprecise, I'm from the engineering domain :) I...
Jun23-14 06:26 AM
Erland
1 1,951
Hey, So I am trying to do a tri-quadratic curve fit (linear regression) in excel. I have successfully completed a...
Jun20-14 11:37 AM
mattskie
2 2,017

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