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

Feb2313 09:24 AM
micromass

1 
35,745 
Hi, everyone! I encounter a problem as follows:
I have got a matrix A, all the entries in A is between 0 and 1....

Jan2210 11:19 AM
tinytim

1 
5,343 
okay so i was reading a book on representations and found this discussion and was confused:...

Jan2210 08:29 AM
wofsy

3 
4,915 
Has anyone seen this before? It must have been noted before!
Let c = a+b and d = ab Then the series S_{n} =...

Jan2110 09:32 PM
JSuarez

1 
1,757 
I am starting Number Theory this semester. My professor hands out notes but there is no textbook for the class. So...

Jan2110 07:42 PM
ramsey2879

5 
2,884 
Hello dear forum members I wanted to know where are the research on the Riemann hypothesis , the latest advances ,who...

Jan2010 07:58 AM
CRGreathouse

3 
2,037 
Oh it gives me headache... been thinking on this problem for a while, and don't even know where to begin! Could any...

Jan2010 03:18 AM
dlevanchuk

2 
2,832 
on U, where U = span{(1, 1, 1, 1), (2, 0, 3, 1)}

Jan1810 10:11 PM
rochfor1

1 
975 
I have calibration data and I'm want to use the following model:
y = a + b*Ln(x)+ c*x
I'm looking for a way to...

Jan1810 02:16 PM
Lord Crc

1 
981 
I know it's a dumb question but I can't figure out why the totient of n is always even (I've read in a book that it...

Jan1810 02:04 PM
crypto_rsa

3 
4,781 
Hi,
I try to get a grasp on semidirect products, by notes written by Patrick J. Morandi ("Semi direct products")....

Jan1810 07:17 AM
haushofer

3 
1,025 
Hello everyone, I have been trying to teach myself number theory and I am stuck trying to prove a (I am sure) very...

Jan1710 03:05 PM
dodo

3 
1,888 
Is the following correct, as far as it goes?
Suppose I have a vector space V and I'm making a transformation from...

Jan1710 10:26 AM
Landau

3 
4,262 
I've been trying to simplify a formula that looks something like this:
X = \sum_{k=0}^{\infty} v_{x} v_{y}
where...

Jan1610 06:51 PM
diazona

0 
944 
i'm working through the following text and I think I found an error please let me know if i'm totally wrong.
...

Jan1610 05:44 AM
Spartan Math

3 
2,530 
Consider the following:
v = (v1, v2)
w = (w1, w2)
If v1 = w2 and v2 = w1 then the vectors v and w are...

Jan1510 09:39 PM
Noxide

0 
1,248 
I'm stuck with the attached practice problems. does anyone with knowledge of category theory please have solutions?

Jan1510 06:30 PM
razizi

2 
865 
Hi. I might just have something here. Please let me know if you have any questions or comments. Thanks. Andy Lee....

Jan1510 08:27 AM
Andy Lee

48 
8,964 
I was thinking on the square root of 2 being irrational proof... and I got the idea that you could use the same idea...

Jan1510 06:46 AM
HallsofIvy

6 
1,489 
need a help cant seem to figure out this one
let 6 = (2,R)
a. Find c
b. c
c find 2(6)

Jan1410 06:51 PM
kateng33

2 
971 
I am a member of the Dozenal Society of Great Britain ( www.dsgb.orbix.co.uk ) . We maintain that base twelve is...

Jan1410 03:17 PM
HallsofIvy

34 
7,395 
Just encountered this word, not sure what it means. I tried google and wiki, but didn't find any introductory...

Jan1410 03:14 PM
HallsofIvy

4 
1,983 
Claim: n! + 1 and (n+1)! + 1 are relatively prime.
How can we prove this? Can we use mathematical induction?
Base...

Jan1410 01:09 AM
Ivan,Cow'sSon

45 
7,160 
Hi All,
This is my first post. I am an Electronics Engineer and came by this great forum while searching something...

Jan1310 10:25 PM
pd5009

2 
1,336 
hi every on
i search for 3 books in the cryptography but i could found it
please help me to get it
the...

Jan1310 03:58 PM
berkeman

4 
1,455 
Ok so I am not a math major and i haven't taken an abstract algebra class but i am curoius about the subject. I have...

Jan1310 01:32 PM
wofsy

3 
1,052 
hi,
this is my first post on this site so please excuse me (and correct me) if i am not posting according to the...

Jan1310 07:00 AM
wofsy

10 
2,910 
Is there such a thing as a cross product for R4 vectors? Can you use the permutation symbol to express it in the same...

Jan1310 04:16 AM
bchui

5 
12,147 
What does this phrase mean? I see it every now and again and can't figure it out. Are they say group B is the...

Jan1210 01:48 PM
Newtime

8 
1,453 
Hello,
I am working through some examples for revision purposes and am pondering over this question so would...

Jan1110 12:47 PM
rochfor1

1 
2,548 
Hi
I'd like to show that SU(n) is a normal subgroup of U(n).
Here are my thoughts:
1)The kernel of of...

Jan1110 07:47 AM
wofsy

3 
1,888 
Does anyone know how can I calculate the abeliazation of the group G=<a,b>
(when a and b are totally free and...

Jan1010 06:48 PM
wofsy

1 
934 
Hey guys, i've been doing a lot of reading on quantum mechanics lately and realised immediately that i am not going to...

Jan1010 06:29 PM
VeeEight

1 
1,026 
Hello,
I came to some problems with multiplcation of some matrices.
how do I multply this:
x
y
z
with
a
b

Jan1010 01:39 PM
elibj123

10 
924 
Hello,
Let's say I have a 2x2 matrix,we call it A with the eigenvalues +1 , 1.
Now I lets define that m=m0*A. (m0...

Jan1010 01:35 PM
elibj123

1 
754 
Theorem:
For all a,b,c E Z such that a and b are not both 0,
there exist x,y E Z such that ax+by=c <=> gcd(a,b)c....

Jan910 08:56 PM
JSuarez

13 
5,357 
I have question, can someone please check whether my answer is correct or not:
1)Let \pi_i be representations of a...

Jan910 12:40 PM
vertices

6 
1,265 
my question is , given the Group G of symmetries for the equation
x^{4} + a^{2}=0
for some 'a' Real valued i...

Jan810 04:51 PM
rochfor1

1 
756 
Two questions:
1. We add the digits of any number. If the sum is divisible by 3, then that number is divisible by...

Jan810 05:17 AM
elibj123

2 
5,841 
I am trying to show show that there is no homomorphism from Zp1 to Zp2. if p1 and p2 are different prime numbers.
...

Jan710 04:57 PM
vertices

14 
2,817 
please explain me associativity for multiplication modulo n

Jan710 06:31 AM
HallsofIvy

1 
2,425 