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

Feb2313 09:24 AM
micromass

1 
35,040 
Hi
I want to find inverse of singular matrix......
Is there any method to find it???
Please help me out.....
...

Jan1812 06:24 AM
micromass

6 
10,647 
I have been thinking about this for a week and I simply can't get anywhere.
consider a 4x4 diagonal matrix such...

Dec1607 09:48 PM
Defennder

1 
10,616 
How would i start to solve this problem?
x^2 + 1 == 0 (mod 5^3).
Find all solutions.
How do i know how many...

Dec2004 10:15 PM
Hurkyl

2 
10,582 
I'm trying to learn linear algebra by myself from a book called "Introduction to linear algebra" by A.D. Martin and...

Dec3103 11:29 AM
Muzza

4 
10,484 
Hello,
It is known that a system of linear equations is considered overdetermined if there are more equations than...

Feb2712 04:23 PM
Borek

14 
10,458 
Hey,
A while ago i hear about finding the division number theory . And i am wondering if there is a theory...

Oct2804 11:18 AM
Gokul43201

3 
10,449 
How do i find the eigenvalues and eigenvectors for the linear operator T defined as
T(w,z) = (z,w)??

Mar508 09:37 PM
mathwonk

6 
10,423 
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 
10,406 
Let A and B be nxn matrices.
1. Suppose that AB=AC and det A does not equal 0. Show that B=C
2. Show that A is...

Mar2509 07:51 PM
sutupidmath

6 
10,392 
I have the second printing of the first edition of Herstein's 'Topics in Algebra', published 1964.
On page 58 near...

Aug3008 01:05 PM
peter_n

6 
10,367 
Proof:
1. why you need at least m vectors to span a space of dimension m.
2. If m vectors span an mdimensional...

Mar2008 10:42 AM
HallsofIvy

8 
10,364 
Hey,
I need help with thris proof.. :)
Say A is a skewsymmetric matrix. Is B=A^2 skewsymmetric, symmetric or...

Oct2306 12:37 AM
robphy

1 
10,361 
I'm just beginning my study of rings, and I'm wondering if there are some standard ways to show that two rings are not...

Apr2309 01:16 AM
matt grime

11 
10,358 
I find it rather tedious to calculate the eigenvalues of a 3x3 matrix. For example
The \emph{characteristic...

Apr1709 03:12 AM
matt grime

2 
10,339 
In the "origin of zero" thread, I saw the following remark:
I had heard a different story, in a pythagorean mood:...

Apr1605 01:34 PM
neurocomp2003

6 
10,338 
How is measure theory associated with number theory, if at all.
If they are connected, can anyone give a link?

Nov2107 04:02 PM
morphism

18 
10,307 
There are 2 issues I want to talk about in this post.
(1) General algorithm for gaussjordan elimination computation...

Apr409 08:06 PM
junglebeast

0 
10,299 
I assume everyone who saw this thread first rolled their eyes. Sorry for that. My question is an innocent one, as I...

Jan2511 10:58 AM
Max™

39 
10,234 
HI, I am taking linear algebra this semester, So i wanted to know..what does linear algebra deals with? Is it really...

Jan1406 04:28 PM
Kouros Khamoushi

17 
10,224 
Hi all! I was working on some homework for the linear algebra section of my "Math Methods for Physicists" class and...

Oct1409 03:00 AM
Matthollyw00d

2 
10,183 
I don't really understand why it hasn't been numerically added into modern math. I mean, we make all kinds of...

Mar1709 05:27 AM
HallsofIvy

66 
10,166 
Hi.
Do you know of any package to draw Coxeter graphs and Dynkin diagrams in LaTeX directly?
Currently I'm...

Dec1907 05:00 PM
robphy

2 
10,160 
I'm reading the Wikipedia article, trying to understand the definition of the tensor product V\otimes W of two vector...

Jun1808 11:43 AM
Fredrik

33 
10,151 
right now, my concept for their difference is that linear transformations are 1 to 1, where as nonlinear...

Nov509 04:04 AM
HallsofIvy

2 
10,143 
We have two nxn matrices with nonnegative elements, A and B.
We know the eigenvalues and eigenvectors of A and B....

Nov710 04:55 PM
Leo321

2 
10,141 
hi, i don't really understand whats the difference between vector product and dot product in matrix form.
for...

Apr2710 11:42 AM
quietrain

6 
10,133 
Hi, I'm a grad student in pure math and I'm trying to relearn my linear algebra from scratch because I never learned...

Nov1709 06:25 AM
Ruslan_Sharipov

7 
10,113 
Wikipedia details the technique for converting from toroidal coords to cartesian. How do you convert the other way?
...

Feb2608 04:47 AM
pkleinod

22 
10,111 
If I have a set of numbers from 1 to N, I want to know how to count sets such that the highest number in the set is...

May2612 09:17 AM
ClifDavis

102 
10,111 
How do i get the point of intersection of a line and a circle.. I got lots of information on this topic, but my...

Aug709 07:26 AM
fatra2

3 
10,095 
Any explanation would be great. Also, are there any examples of finite Integral domains that aren't fields?

Feb411 09:03 PM
Spartan Math

7 
10,082 
Hi all. I'm having a really tough time figuring out how to solve this problem:
Suppose that {v1, v2, v3} are...

Apr2311 08:00 PM
CatAteMyHW

6 
10,041 
How do I take the cross product of Two 3x3 Matrices.
For example what is cross product of:
x

Dec409 09:09 AM
dellatorre

5 
10,019 
how to plot the irrational number pi on a number line. i know the procedure for square roots of differant nonperfecr...

Nov1805 04:07 AM
Aditya89

7 
10,012 
Hi, has anyone else seen this news item http://www.physorg.com/news/201101maththeoriesrevealnature.html on how to...

Mar1711 05:26 PM
Raphie

12 
10,012 
While reading text, I had a question which I can not resolve by myself. Please Help me!
it reads, The empty set( a...

Sep2905 01:35 PM
Adriadne

33 
9,995 
Hello,
I have searched through out the internet but I couldn't find any information about the origin of Pascal...

Jul1208 03:20 AM
roam

7 
9,945 
Hi.
I have a question.
I know the rule of the hightest power of 2 dividing n!, the highest power means if 2^{k}n!,...

Oct2107 01:40 AM
whodsow

4 
9,939 
simple problem... 3x = 1 (mod 16), find all possible values of x mod 16
so this is what i've come to:
3x = 1 +...

Mar108 04:41 PM
ramsey2879

7 
9,911 
Do you ever think up theorums and think: "that's inetersting, I wonder if anyone's ever thought of that before?"
In...

Nov2305 12:34 AM
mathwonk

5 
9,906 