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

Feb2313 09:24 AM
micromass

1 
30,518 
I'm studying for a test.
In doing one of the old tests and it had a question that I couldn't do.
Let T: Rn...

Sep2109 03:01 PM
HallsofIvy

1 
690 
Suppose we have a system of 2 equations in 2 unknowns x,y:
a1x+b1y=c1
a2x+b2y=c2
If the determinant of
is...

Sep2009 01:46 AM
kingwinner

1 
9,020 

Sep2009 01:04 AM
Talisman

0 
532 
Hi!
Im messing around with a Lie 3Algebra at the moment(Im not sure how widespread these are. They obey similar...

Sep2009 12:30 AM
Digs

3 
1,089 
Suppose a, b are vectors in R^n, R^m resp. What can I say about the length of a\otimes b wrt a and b?
You can think...

Sep1909 08:43 PM
Dragonfall

3 
751 
How can I get the determinant of this matrix?
1n 1 ....1 1
1 1n ...1 1
. . . .
. . ...

Sep1909 05:05 PM
encomes

4 
1,058 
Hi
I was wondering if someone can explain what projection of vectors and scalars mean. I read a lot of site but...

Sep1909 04:56 PM
HallsofIvy

1 
819 
Let \mathbb{P} the set of primes. Lets p,q \in \mathbb{P} and p \le q. Find the pairs (p,q) such that 2^p+3^q and...

Sep1909 12:35 PM
rrronny

5 
1,505 
So this is a curious little question, where p and q are of course primes. Not quite sure how to go about it. Clearly...

Sep1809 08:10 PM
Spartan Math

0 
1,069 
This specifically relates more towards the argument as to why an inverse exists.
First the problem
The...

Sep1809 08:22 AM
cmj1988

1 
4,274 
I have the following two equations
#1
d(A(t))/dt=A(t)B
where A is some matrix that depends on parameter t,...

Sep1809 05:53 AM
trambolin

1 
919 
Hi,
I'm trying to derive the KullbackLeibler divergence between two multivariate gaussian distributions, and I need...

Sep1709 03:07 PM
CuppoJava

2 
2,308 
Can anyone explain to me why each field of characteristic zero contains a copy of the rationals, or a subfield that's...

Sep1609 11:15 PM
Office_Shredder

1 
3,365 
?=\prod_{n=1}^\infty(n/(n+1))

Sep1609 10:02 PM
Loren Booda

3 
1,480 
Let p_i denote the ith prime number. Prove or disprove that:
1)\quad \displaystyle S(n) : = \sum_{i = 1}^n \mu(p_i +...

Sep1609 08:50 AM
rrronny

2 
1,648 
Can anyone pls help to solve the solution set of the system of equations given above, where a, b, c are unknowns.
...

Sep1609 08:28 AM
oceanhow

2 
905 
Hi,
I have a question related to Group Theory and its interpretation from a social point of view.
if we suppose,...

Sep1509 04:10 PM
Rasalhague

2 
2,270 
I have a group whose Z2 cohomology ring I'd like to know. Any help would be appreciated.
It is a finite 2group...

Sep1509 03:33 PM
wofsy

0 
840 
Can you explain me why 0^0=1 but 0^1=0 ??
:cry:

Sep1509 01:07 AM
D H

16 
2,154 
Hi,
While trying to simplify a solution I came up with the following sparse matrix but don't know how to solve it. ...

Sep1409 09:01 PM
loveequation

15 
2,718 
I read in a book on groups and representations that any transitive Gset is isomorphic to the coset space of some...

Sep1409 06:29 PM
Office_Shredder

3 
1,772 
The following notation is from the book "Frames and Bases."
Let f and g be vectors in R^{n} with the usual dot...

Sep1409 05:58 PM
CantorSet

2 
3,104 
Given V = {(x1; x2;….; xn)  Σni=1 xi=0}
(sum of vectors is equal to zero) be a subspace of Rn. How can we find a...

Sep1409 07:14 AM
HallsofIvy

1 
5,074 
I don't understand the asepcts of matrices infinite.
Let say I have 3 x 3 matrix
A =
b =
I want to find...

Sep1409 06:51 AM
HallsofIvy

3 
1,047 
What does it mean to quotient a category by an object of the category?
In particular, the problem in front of me...

Sep1309 12:32 PM
Hurkyl

1 
733 
Let k and n \le X be large positive integers, and p is a prime. Define
F(X,n) := \sum_{\substack{k^2+p = n\\X/2\le...

Sep1309 10:48 AM
flouran

1 
2,055 
My problem is this.
I work on a mine, trucks have a average weight that they can carry (should be approx 180...

Sep1209 02:04 PM
YellowPeril

3 
1,372 
How can I show that (a^n b^n) doesn't divide (a^n + b ^n) for all integers a,b, and n?
I have that if (a^n b^n)...

Sep1209 03:38 AM
Borek

12 
2,142 
Does anybody have a good book/website where I can find good information on how to use the maximum on matrices. I have...

Sep1109 12:16 PM
morphism

6 
740 
Hello all,
Say I had n equations, with n variables, so that
C1 = C1(f1), C1 is a funtion of f1 only
C2 = C2(f1,...

Sep1109 08:44 AM
HallsofIvy

3 
932 
The problem (#3) can be found here:http://img198.imageshack.us/i/img002lf.jpg/
It would be helpful if someone could...

Sep1009 02:52 PM
Fisicks

2 
1,203 
Im writing some java code and need help with some matrix math... :confused:
Basically Im trying to figure out how...

Sep909 03:47 PM
yakerdude7

0 
6,504 
I have been doing some reading on Kalman filters trying to figure where to start. I have done some college level...

Sep909 02:36 PM
D H

3 
907 
What is the number of solutions d(p) of
Nn^2 \equiv 0 \pmod p
where p is a prime and n and N are positive and N...

Sep909 02:07 PM
CRGreathouse

14 
2,050 
What is the last digit of 2222^{50}~+~7777^{16}?
I know how to do these kinds of questions, but this time around I...

Sep909 07:42 AM
Borek

11 
10,233 
Collatz 3n+1 Problem Structure
I mean really read it, to where they understand it, not just
to the point where...

Sep809 11:19 PM
Mensanator

0 
2,485 
how can i find out that all vectors of (x,y) are a linear combination of some vectors for example (3,4) and (6,8)?

Sep809 06:45 AM
HallsofIvy

1 
1,978 
Hi,
I'm trying to solve some problems in "Stroud's Engg mathematics"....
I'm stuck with these 2 questions:
Σ...

Sep709 10:40 PM
Ubinunc

16 
3,735 
New here, have an assignment concerning Cramer's rule which I think I have a decent understanding of  I can use it to...

Sep709 08:36 PM
GimB0id

4 
1,613 
I have a rather simple question which requires a direct answer:
We have two functions, f(x) and g(x).
I know...

Sep709 11:28 AM
flouran

3 
1,781 