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

Feb2313 09:24 AM
micromass

1 
34,803 
Hi everyone.
My first post on this great forum, keep up all the good ideas.
Apologies if this is in the wrong...

Nov1511 05:18 AM
pwsnafu

1 
1,742 
I have read at a lot of places that in 2D transformations rotation is a combination of scaling and simultaneous shear?...

Nov1511 04:18 AM
Deveno

3 
2,812 
Which of the transformations are onto?
1) T:R2 > R2, where T(x,y) = (5xy, 0)
I don't know if I'm understanding...

Nov1511 03:47 AM
Deveno

1 
1,488 
Let Fn = 22n + 1 be the nth Fermat number and suppose that pFn, where p is a prime (possibly Fn itself). Show that ...

Nov1411 10:25 PM
demonelite123

4 
2,060 
If we take the derivative of n functions that are linearly independent to each other and we write it down like c1f1(x)...

Nov1411 03:30 PM
AdrianZ

8 
2,197 
Hi guys,
I have a bit of a strange problem. I had to prove that the space of symmetric matrices is a vector space....

Nov1411 02:12 PM
Rowina

0 
929 
Do tuples exist which aren't elements of a cartesian product of sets?
Can you just write an ordered list of elements...

Nov1411 09:18 AM
eztum

3 
1,406 
This is more of a conceptual question more than anything. I've never done any financial modelling, let alone modelling...

Nov1211 10:32 PM
Stephen Tashi

1 
2,981 
I have an equation:
tr\left\{\textbf{AB}\right\} = \sigma
where tr\left\{\right\} denotes the matrix trace. The...

Nov1211 02:56 PM
weetabixharry

5 
1,487 
Hello. First, I'd like to apologize because I don't know where to go ask for homework on linear algebra on the forums...

Nov1211 09:21 AM
sam0617

6 
6,095 
Hi, I wonder that is there any way to disassemble this operation ((n+2^(n2))^2 mod 1000000007) without counting...

Nov1211 07:47 AM
I like Serena

15 
3,841 
Consider a category C with objects ob(C) and morphisms hom(C). Suppose there is a subcategory D such that ob(D)=ob(C)...

Nov1211 07:10 AM
tmatrix

0 
805 
I have heard about the Riemann Zeta function to be some kind of physical partition function..my question is..could we...

Nov1211 01:31 AM
Mats Granvik

5 
3,577 
Let A be a nonzero matrix of size n. Let a k*k submatrix of A be defined as a matrix obtained by deleting any nk rows...

Nov1111 09:16 PM
Deveno

2 
2,671 
Hi. I'm preparing the Linear algebra 1 Exam for the first year of
Physics University. I find very difficult to...

Nov1111 04:25 PM
Bacle2

1 
2,151 
If A and B are both invertible square matrices of the same size with complex entries, there exists a complex scalar c...

Nov1111 03:48 PM
Grothard

2 
1,524 
Hello, how to find matrix 4x4 which only contains whole numbers and has inverse matrix with whole numbers only aswell?...

Nov1111 11:59 AM
Bacle2

10 
2,635 
I think this is true but not sure how to prove it. Suppose that A and B are both totally unimodular matrices then is...

Nov1011 11:02 PM
hedgeway

0 
854 
I was browsing through the Notation section of my favourite book and noticed that symbols were defined for the "sets"...

Nov1011 01:49 PM
SteveL27

12 
4,007 
Can anyone tell me how to calculate the discriminant of a general equation of 2 degree in 2 variables,...

Nov1011 09:26 AM
Stephen Tashi

3 
2,920 
I tried googling this first and of course looked at my notes but the questions asked pertaining to dimensions were...

Nov1011 08:44 AM
sam0617

4 
1,629 
If you have a matrix that is a combination of a diagonal, upper, and lower matrix  what is the best way to solve it?...

Nov1011 04:44 AM
weetabixharry

1 
2,386 
Hello, I'm currently selfstudying "An Introduction to Convex Polytopes" and I'm having some trouble understanding the...

Nov1011 01:45 AM
Caramon

2 
1,608 
I have a question about the exterior product. Is it true that
\mathbf{a}\wedge\mathbf{b}= \mathbf{a}\times...

Nov1011 12:50 AM
chiro

7 
1,483 
In an example in my algebra text, (from the section on unique factorization domains) it is describing the ring...

Nov911 08:06 PM
alexfloo

1 
1,059 
I've been stuck on this problem for so long it's getting ridiculous. Please help!
I have a complex matrix,...

Nov911 05:53 PM
weetabixharry

6 
2,367 
Hi all,
it is of course true that every linear map between two vector spaces can be expanded by means of the...

Nov811 11:11 AM
ivl

1 
1,810 
Hi,
I'm not sure this should go in homework of here as this was a test question, but the question its self isn't a...

Nov811 07:28 AM
HallsofIvy

14 
1,598 
I came accross this question. Is the group (ℤ/34/ℤ)x cyclic?
We haven't discussed the theorem in class that any units...

Nov811 02:03 AM
Bachelier

2 
1,146 
T: Mnn => R, where T(A) = tr(A)
Attempt:
1) T(kA) = tr(kA) = k tr(A) = k T(A)
2) T(A+B) = tr (A + B) =...

Nov711 10:30 AM
Deveno

1 
1,509 
I am dealing with a problem,which can be formulated Ax=B,in the first place I wanted to solve it with conjugate...

Nov711 07:40 AM
AlephZero

1 
891 
Hi guys
So I'm studying for my test tomorrow and I understand how to find the dimensions of ColA and NulA, but what...

Nov711 02:37 AM
Deveno

5 
1,495 
Hello!
I was just thinking, say, I have a plane with the equation x + 3y + 2z = 0. How would I go about finding...

Nov611 06:08 PM
HallsofIvy

1 
937 
Let K1={a + (2^0.5)*b}  a,b rational numbers}, and K2={a + (3^0.5)*b}  a,b rational numbers} be two fields with the...

Nov611 04:52 PM
Deveno

1 
871 
Hello,
Does anyone know if this makes sense or is usable?
I've only been able to describe it through a graph....

Nov611 09:48 AM
elegysix

4 
2,054 
if G = n . And G has 2n1 subgroups, prove G = <e> or it is isomorphic to Z2.
I am thinking I need to show that n...

Nov511 07:19 PM
Deveno

11 
3,334 
After long and careful search on the web and in literature,
I could not find the solution of the following problem....

Nov511 06:13 PM
Ulam

5 
1,995 
A statement in a book of analysis I have says:
(Q,+, .) is a commutative ring with an identity element.
I assume...

Nov511 04:01 PM
bentley4

12 
1,446 
About two years ago, a friend of mine published his licentiate thesis in mathematics. As an nonmathematician I...

Nov511 12:10 PM
Guffel

0 
1,074 
Hey guys
So the problem I'm having here is spans!
I know that a basis of a vector space is a linearly...

Nov511 08:55 AM
HallsofIvy

5 
3,141 