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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 34,085
Hi, I have a rather trivial question but google did not really help me. So far I was always familiar with the fact...
T 07:27 AM
HallsofIvy
2 55
I heard about fast tridiagonal matrix algorithm. I tried to find what is it but I can only find tridiagonal matrix...
Y 11:58 AM
Shyan
0 68
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
2 270
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
3 160
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
6 227
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
3 236
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
4 834
Problem 1: Use Gaussian elimination with back substitution to solve the following system. Problem 2: Use the...
Jul19-14 12:38 PM
micromass
6 438
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
4 309
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
2 299
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
2 409
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
3 498
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
4 842
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
1 638
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
1 881
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
3 671
The definition (taken from Robert Gilmore's: Lie groups, Lie algebras, and some of their applications): We have...
Jul14-14 01:22 PM
Travis091
6 836
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 4,370
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 1,721
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 1,808
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 1,377
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 1,520
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 1,947
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 1,457
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 1,447
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 1,360
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 1,349
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 1,391
1. Is there a general condition for the existence and uniqueness of solution of a system of simultaneous non-linear...
Jun19-14 07:40 AM
Chestermiller
7 1,556
Please excuse my terminology as I am teaching myself linear algebra. I am attempting to construct a vector which...
Jun18-14 08:52 PM
Simon Bridge
14 2,165
I'm interested in spherical geometry in 4 dimensions. Surely someone has done this, but what is it called? I can't...
Jun17-14 03:08 PM
micromass
1 1,298
I've been reading Kreyszig's functional analysis book, and I'm a little confused why he defines the spectral family of...
Jun17-14 02:29 PM
micromass
1 1,273
Hello guys, Let ##T: \mathbb{R^2} \to \mathbb{R^2}##. Suppose I have standard basis ##B = \{u_1, u_2\}## and...
Jun17-14 06:08 AM
Seydlitz
4 1,419
I want find a value M such that given v and u, satisfies the equation v=Mu. Well, the vector u has a modulus u and...
Jun15-14 06:40 PM
WWGD
11 1,481
Hi. This is driving me mad: \hat{\vec{\nabla}}(\hat{\vec{A}})f=(\vec{\nabla}\cdot\vec{A})f +...
Jun15-14 02:00 PM
carllacan
4 1,383
In a previous thread, I asked a question different from that I actually intended to ask. Since this question is licit...
Jun15-14 12:58 AM
micromass
4 1,351
Hello, Thanks to the help of micromass in a previous thread, I am now able to prove the following theorem (which...
Jun14-14 05:36 PM
coquelicot
5 1,365
My Goal: to find what fraction of my monthly payment should go to each loan. The ideal outcome would be to pay the...
Jun14-14 12:19 AM
Stephen Tashi
4 1,422
The gist of the approach I took is that∑1/p = log(e^∑1/p) = log(∏e^1/p) and logx→ ∞ as x→∞. Proof outline: let ∑1/p...
Jun13-14 06:43 PM
mathwonk
5 1,428
Let R be an integral ring (eventually can be supposed integrally closed), and R' an integral extension of R. Assume...
Jun13-14 06:40 PM
mathwonk
4 1,385

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