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

Feb2313 09:24 AM
micromass

1 
35,094 
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 
7,096 
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 
1,327 
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 
1,446 
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 
1,045 
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 
2,884 
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 
12,112 
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 
1,440 
Hello,
I am working through some examples for revision purposes and am pondering over this question so would...

Jan1110 12:47 PM
rochfor1

1 
2,531 
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 
1,870 
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 
930 
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 
1,013 
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 
919 
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 
750 
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 
5,330 
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 
1,256 
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 
750 
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 
5,807 
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 
2,783 
please explain me associativity for multiplication modulo n

Jan710 06:31 AM
HallsofIvy

1 
2,413 
I've been trying to prove something that seems obvious but have had no success thus far:
say G is a finite group...

Jan710 03:55 AM
SiddharthM

2 
821 
HELLO ! THIS IS MY FIRST POST HERE.
I spend countless hours playing with numbers and found a general formula to...

Jan610 11:06 PM
Antuan

26 
6,048 
I'm not sure if this is the best forum for this post, but no single forum seems to be a better fit, and I bet the...

Jan610 10:42 PM
coolnessitself

0 
1,268 
Just curious, are there any?

Jan610 10:18 PM
kof9595995

8 
2,812 
Can anyone give me an element in a cyclotomic extension of the rationals that has modulus one but that isn't an...

Jan610 07:51 AM
SiddharthM

0 
748 
These are probably a bit stupid, so I hope you don't mind me asking them...
1)what is a fundamental representation?...

Jan610 07:26 AM
vertices

4 
1,037 
I've noticed that the order that you do some elementary row operations in for by hand row reduction or gaussian...

Jan510 08:54 PM
Ben1220

0 
1,626 
I'm reviewing my Group theory notes at the moment. I have a few questions.
1)what is the "connected component of...

Jan510 08:29 PM
Fredrik

4 
1,167 
3\times2^{m}+1=n^{2}
For some positive integers m and n.

Jan510 12:13 PM
robert2734

3 
1,234 
I'm reading the book "Numbers" by Ebbinghaus et al. (Springer Verlag); I can't understand what's the main idea about...

Jan510 04:16 AM
kowalski

5 
2,907 
Hi,
I have been struggling with this problem for a while, and I have not found the answer in textbooks or google. ...

Jan410 04:57 PM
marcusl

1 
4,133 
In the first equation on this page,
http://www.physicsforums.com/library.php?do=view_item&itemid=335
is there a...

Jan410 05:12 AM
Fredrik

1 
953 
Dear all,
does any of you know if there is a routine from popular math libraries (like lapack) which can be used to...

Jan410 03:34 AM
hongbin_zhang

0 
1,371 
I'm working through a proof that every linear operator, A, can be represented by a matrix, A_{ij}. So far I've got
...

Jan210 03:43 PM
Fredrik

2 
5,015 
Help me to solve this equation in algebra
More than its width A rectangle has a length of 10 mm long . It has a...

Jan210 03:31 AM
tinytim

1 
705 
Any pointers and/or help with proving the following would be appreciated
For every prime number n, there exist...

Jan110 10:04 PM
ramsey2879

2 
1,798 
I'm having trouble grasping what an irreducible representation is. Can someone explain what this is through an example...

Jan110 09:04 PM
meopemuk

3 
1,435 
When we solve for a variable in say two linear equations, by what property we are allowed to add one equation to the...

Jan110 08:02 PM
Fredrik

7 
2,263 
Hi,
it is a clear fact that rotations in 3D keep the vectors on the rotation axis unchanged.
In 2D only the zero...

Jan110 11:39 AM
D H

10 
3,261 
I still don't fully understand the explicit construction of the tensor product space of two vector spaces, in spite of...

Dec3109 05:16 PM
Fredrik

12 
5,043 
Why isn't there a superalgebra having only three basis, c, a,b where c is even and a,b are odd and =a, =b, =c?

Dec3109 10:19 AM
johnstrass

1 
975 