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

Feb2313 09:24 AM
micromass

1 
34,981 
Hello,
I'm in an introductory course about quantum computing. My math experience is fairly solid, but not very...

Mar2213 08:01 PM
Ocifer

2 
603 
Good afternoon!
I am working on a problem, where I at some point have to find the intersection between a polytope...

Mar2213 05:16 AM
alsm

0 
524 
Let an,m be defined for the nonnegative integers n and m such that n ≥ m.
an,0 = 1
am,m = m!
an+1,m+1 = (m+1)...

Mar2113 10:13 AM
conquest

1 
716 
Hi everyone.
Is there any way to set demands on least square solutions?
I have an equation on the form Ax=b,...

Mar2113 07:59 AM
Marvin_MKII

4 
999 
I think this may be a simple yes or no question. I am currently reading a book Vector and Tensor Analysis by...

Mar2013 03:49 PM
atyy

4 
1,467 
Claim: If p \in R is irreducible and nonzero, then p is irreducible and prime in R
Proof: Let I be the ideal...

Mar2013 03:44 PM
jbunniii

1 
604 
it seems to have many different ways to express a determinant, when we are using indices to write vectors and tensors,...

Mar1913 11:45 PM
chiro

1 
580 
Hello! If anybody has a minute, I'd appreciate a quick lookthrough of my proof that a finite abelian group can be...

Mar1813 02:37 AM
jbunniii

4 
931 
Let A be any real invertible matrix. There exists a nonzero diagonal matrix D such that A^T D A=D.
I'm pretty sure...

Mar1613 12:52 AM
fzero

8 
1,544 
Consider an unbounded selfadjoint operator defined in a hilbert space(its domain isn't the entire hilbert space,of...

Mar1513 10:28 AM
micromass

1 
606 
There is some theorem along the lines that any category of schemes embeds into a suitable Grothendieck topoi. What is...

Mar1513 02:45 AM
Jim Kata

1 
527 
Hello !
I have an upper triangular matrix for an operator T in which an eigen value has been repeated s times in...

Mar1313 05:08 AM
vish_maths

9 
1,289 
Hi all,
Say that I already know W1, W2 are both subspaces of a vector space V, W1∩W2={0}, and that...

Mar1213 12:46 AM
jbunniii

1 
827 
Hello,
In my abstract algebra class, my teacher really stresses that when you show that a set is a group by...

Mar1113 06:14 PM
Fredrik

3 
717 
Is there a nice way to show that Det(AB)=Det(A)Det(B) where A and B are n x n matrices over a commutative ring?
I'm...

Mar1013 07:52 PM
Bacle2

4 
1,014 
Hi!
I was wondering why it is possible to write any proper orthochronous Lorentz transformation as an exponential...

Mar1013 12:42 PM
wisvuze

7 
1,246 
I'm trying to find a way to simplify a complicated proof. The worst step of the proof involves a product of five 4×4...

Mar1013 06:36 AM
Fredrik

2 
725 
There's this theorem:
A linear map T: V→W is onetoone iff Ker(T) = 0
I'm wondering if there's an analog for...

Mar913 09:11 PM
HallsofIvy

8 
1,319 
how do you prove the distributive quality of the cross and dot products?
thanks very much!

Mar913 04:37 AM
mathnerd15

15 
1,559 
Hey everyone, im trying to figure this out, but no luck. Help would be much appreciated. So i am considering a...

Mar913 03:50 AM
jbunniii

2 
605 
Let q be a prime, k= q2 and X be an Integer,
I have found solutions for q=5,7,17 for the equation
(2^k)  7 = X^2...

Mar913 03:45 AM
Mickey1

12 
4,077 
Am i correct if I say that Fiedler number surges when percolation is at percolation threshold? Assume a randomly...

Mar813 10:44 AM
kosmos

0 
468 
To determine if a subset of a vector space is a subspace, it must be closed under addition and scalar multiplication. ...

Mar713 07:36 PM
MoreDrinks

2 
596 
I want somebody to help me what attempts have been made to understand the sequence of prime number. Is the Nth term of...

Mar713 07:33 AM
pedja

7 
6,701 
Can someone give an example of a nonlinear operator on a finitely generated vector space(preferably ℝn)? I'd be...

Mar613 11:19 PM
pwsnafu

5 
276 
In texts about dirac delta,you often can find sentences like "The delta function is sometimes thought of as an...

Mar613 02:57 PM
mathman

4 
654 
a metric on the plane determines an action of SO(2) on is unit circle by rotation.
Suppose one starts with a free...

Mar513 11:28 AM
Vargo

1 
704 
^{}This may be a silly question, but if I have an 8x3 matrix X, for example, then the rows of this matrix will span R3...

Mar413 07:37 PM
chiro

1 
729 
I want a matrix W of size nxk (where n>>k) with the following two properties:
1. Sum of all elements of each row is...

Mar313 10:01 PM
AlephZero

1 
604 
Hi there all,
I have a personal project I'm working on and since I haven't done any linear algebra in many years...

Mar313 05:56 PM
chiro

2 
769 
Even though this deals with programming an encryption algorithm I feel this is more math based so I'm asking it here....

Mar313 09:28 AM
hackish

2 
705 
What is the most motivating way to introduce the sketching of conics which have a cross product terms?
This topic...

Mar113 03:48 PM
Vargo

1 
636 
Hey I am really confused over free products.
So I understand abstractly, I think. If we have two groups G, H,...

Mar113 01:16 PM
dumbQuestion

4 
724 
Hello everyone,
I’d like to ask the following:
Considering the matrices A and B, both with the dimensions n \times...

Mar113 11:18 AM
GoodSpirit

0 
573 
I am trying to prove that C\otimesC (taken over R) is equal to C^2. The method I have seen is to show the following...

Mar113 08:35 AM
Monobrow

0 
685 
Hey everyone first time poster here, I need help with some factoring of cubes. I know this might tie closely to...

Feb2713 04:34 PM
JNeutron2186

2 
893 
Do you know where can I find proven identity
det(AB)=det(A)det(B)
using Levi Civita symbol.

Feb2613 08:44 PM
micromass

1 
723 
Is it true that for any unital ring (not necessarily commutative), that we have a ring homomorphism for all a = (a_1,...

Feb2513 02:07 PM
mathwonk

4 
1,057 
Can we compare matrices?
If AB>0 is positive definite, can we say A>B?

Feb2513 12:20 PM
jbunniii

1 
646 
Firstly, I apologise if this is the wrong section, but as far as I could tell this was the most relevant.
I have a...

Feb2513 07:09 AM
Ziks

6 
1,514 