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

Feb2313 09:24 AM
micromass

1 
33,691 
Just one simple doubt here.
Can we use different scales on the x and y axes be used for denoting linear...

Y 02:27 PM
HallsofIvy

1 
82 
I know it should be absolute zero, but in a scientific calculator, which is an app actually, its value is shown...

Y 05:34 AM
Adit

3 
112 
Hello,
I am going over these slides and I am very confused on a couple parts. First of all on the first slide, I...

Jul2014 01:19 PM
WWGD

6 
154 
Hello everyone!
I've been learning some basic group theory (I'm new to the subject). And I had a (hopefully) fairly...

Jul1914 06:37 PM
WWGD

3 
148 
Hi,let:
0>A> B > 0
; A,B Zmodules, be a short exact sequence. It follows A is isomorphic with B.
. We...

Jul1914 03:16 PM
WWGD

4 
589 
Problem 1: Use Gaussian elimination with back substitution to solve the following system.
Problem 2: Use the...

Jul1914 12:38 PM
micromass

6 
250 
Hi,
Given several vectors, which may be or not be orthogonal to each other, how to construct a vector perpendicular...

Jul1814 06:25 PM
WWGD

4 
178 
I am working with polytopes that are defined by halfplanes in \Re^N. So they are defined by a number of inequalities...

Jul1814 04:11 PM
sloppyintuit

2 
180 
Hi All,
Let A,B be algebraic structures and let h A>B be a bijective homomorphism.
Is h an isomorphism? In...

Jul1814 12:01 PM
WWGD

2 
242 
Use Gaussian elimination with back substitution to solve the following system:
x1+x2+x3=1,
x1+2x2+2x3=1,...

Jul1714 09:34 PM
Math10

3 
282 
Hello,
Been a long time lurker, but first time poster. I hope I can be very thorough and descriptive. So, I have...

Jul1614 04:02 AM
nikphd

4 
637 
Hi all,
Suppose I have a matrix A_{N\times N}. I compute its eigenmodes
A V = V \Lambda.
V, \Lambda are...

Jul1514 08:06 PM
AlephZero

1 
432 
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...

Jul1414 05:44 PM
Terandol

1 
633 
Hello,
Given the complex linear mapping: T(z) = Az + B where A is real and B is complex. However trying to show...

Jul1414 03:57 PM
WWGD

3 
480 
The definition (taken from Robert Gilmore's: Lie groups, Lie algebras, and some of their applications):
We have...

Jul1414 01:22 PM
Travis091

6 
641 
Two groups are isomorphic if they has same number of elements and if they has same number of elements of same order?...

Jul514 05:24 PM
NeoAkaTheOne

12 
3,868 
Can you guys give me a concrete example of a completely positive map from M_m → M_n?

Jul314 06:26 PM
WWGD

2 
1,464 
Hi,
i was wondering how the following expression can be decomposed:
Let A=BC, where B, C are rectangular random...

Jul214 04:54 PM
MisterX

2 
1,569 
I am trying to diagonalize the following matrix:
M =
\left( \begin{array}{cccc}
0 & 0 & 0 & a \\
0 & 0 & a &...

Jul214 12:45 PM
Trifis

2 
1,165 
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...

Jun3014 04:45 PM
jedishrfu

3 
1,299 
I've been reading about algebraic geometry lately. I see that a lot of authors use ##V^\vee## to denote the dual space...

Jun2914 10:45 AM
Mandelbroth

2 
1,700 
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}...

Jun2814 11:49 AM
Fredrik

9 
1,241 
Hi, Can someone explain me the division operation in the picture. First for left division we use (.\ ) not only ( \ )...

Jun2614 06:22 PM
HallsofIvy

4 
1,218 
I was reading in my textbook that the scalar product of two complex vectors is also complex (I assuming this is true...

Jun2314 08:16 AM
Fredrik

4 
1,136 
Hello,
first of all, sorry if my question is either trivial or imprecise, I'm from the engineering domain :)
I...

Jun2314 06:26 AM
Erland

1 
1,125 
Hey,
So I am trying to do a triquadratic curve fit (linear regression) in excel. I have successfully completed a...

Jun2014 11:37 AM
mattskie

2 
1,165 
1. Is there a general condition for the existence and uniqueness of solution of a system of simultaneous nonlinear...

Jun1914 07:40 AM
Chestermiller

7 
1,332 
Please excuse my terminology as I am teaching myself linear algebra.
I am attempting to construct a vector which...

Jun1814 08:52 PM
Simon Bridge

14 
1,879 
I'm interested in spherical geometry in 4 dimensions. Surely someone has done this, but what is it called? I can't...

Jun1714 03:08 PM
micromass

1 
1,099 
I've been reading Kreyszig's functional analysis book, and I'm a little confused why he defines the spectral family of...

Jun1714 02:29 PM
micromass

1 
1,049 
Hello guys,
Let ##T: \mathbb{R^2} \to \mathbb{R^2}##. Suppose I have standard basis ##B = \{u_1, u_2\}## and...

Jun1714 06:08 AM
Seydlitz

4 
1,172 
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...

Jun1514 06:40 PM
WWGD

11 
1,253 
Hi.
This is driving me mad:
\hat{\vec{\nabla}}(\hat{\vec{A}})f=(\vec{\nabla}\cdot\vec{A})f +...

Jun1514 02:00 PM
carllacan

4 
1,162 
In a previous thread, I asked a question different from that I actually intended to ask. Since this question is licit...

Jun1514 12:58 AM
micromass

4 
1,124 
Hello,
Thanks to the help of micromass in a previous thread, I am now able to prove the following theorem (which...

Jun1414 05:36 PM
coquelicot

5 
1,158 
My Goal: to find what fraction of my monthly payment should go to each loan. The ideal outcome would be to pay the...

Jun1414 12:19 AM
Stephen Tashi

4 
1,201 
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...

Jun1314 06:43 PM
mathwonk

5 
1,196 
Let R be an integral ring (eventually can be supposed integrally closed), and R' an integral extension of R. Assume...

Jun1314 06:40 PM
mathwonk

4 
1,163 
Hi
Is there a form of relaxation/modification of an LP of the form
\text{min }\;\;f^\mathsf{T}x\\\mathbf{A}x\leq b...

Jun1314 08:27 AM
Stephen Tashi

4 
1,189 
Hi, please give me some leeway for my laziness here:
We have that , in the finitedimensional case for vector...

Jun1114 07:50 PM
WWGD

15 
1,405 