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

Feb2313 09:24 AM
micromass

1 
34,915 
alsalam alekum
hi
i need a help in some question
i try but i can not solve it
i have a final exam...

Dec1006 02:07 PM
mathwonk

9 
2,263 
rank(A+B)>=min{rank(A),rank(B)},which holds for allA,B in positive semidefinite matrix

Apr309 09:01 PM
mathsgao

0 
1,032 
Let be PI(x) the prime number counting function ,i have discovered an integral representation for it the integral is...

Feb1205 03:07 PM
Hurkyl

21 
6,109 
hi,
i have only basic knowledge of number theory, but would like to know a hell lot, like maths major level or...

Mar911 10:53 PM
mathwonk

6 
2,091 
Every prime number > 3 could be written as a sum of a prime number and a power of two.
p,q are primes, n is...

Nov1108 11:28 PM
CRGreathouse

93 
10,783 
Rv=...

Apr3005 03:29 AM
strid

21 
2,251 
So, I'm trying to selfteach myself Abstract Algebra, and this idea of cosets is killing me, and I'm not completely...

Sep1211 09:24 AM
Asmoridin

9 
2,760 
Hi,
I've spent dozen of hours searching by myself and dozen of hours searching on the Web. Now I need help.
Who...

Nov3004 05:39 PM
Hurkyl

6 
2,622 
First and foremost, let's get something straight before I post my proof:
I'm not enrolled in any classes. I don't...

May709 09:17 AM
dt666999

14 
2,674 
I thought the definition of a field was the set of all real numbers plus addition and multiplication (or whatever the...

May812 04:58 PM
jpcjr

7 
1,511 
Hello,
I need help in this two quetion. Please, show me all the steps to solve them.
1 Find the distence from a...

May1809 02:57 PM
jbunniii

2 
1,075 
I need help proving if a + a = 0 then a = 0. Thanks!

Jul1304 04:08 PM
mathman

1 
1,441 
Hi
i need help to prove this theory:
GCD(n.m)=1 <=> GCD((2^n)1,(2^m)1)=1
n,m real numbers

Dec1708 10:33 PM
robert Ihnot

3 
1,597 
Hi, can somebody help me out with this question:
A car is stuck on the side of the road and the driver has only a...

Sep2204 02:12 PM
Windwaker2004

2 
1,061 
what are the range of values of k that gives the equation (k+1)x^2+4kx+9=0 ...I work it out :confused: ...please help

Oct504 07:52 PM
Spectre5

34 
2,649 
The Farey sequence F_n (F subscript n) for any positive integer n is the set of irreducible rational numbers a/b with...

Apr1311 02:17 PM
Bill Simpson

5 
2,078 
Alright. As stated in the title above.
So, a subspace is a set of vectors that satisfies:
1) It contained the zero...

Mar809 04:24 PM
HallsofIvy

8 
9,257 
We have:
z = (2^(mn)  1)/, where (2^m  1) and (2^n  1) are prime numbers.
Prove that (2^m  1) and (2^n  1) are...

Nov2110 05:50 AM
helgamauer

1 
965 
I know how to use determinants to solve a system of linear equations, I know I can use them to find the rank of a...

Jul1812 06:51 AM
AlephZero

5 
1,128 
For an exercise, I want to axiomatize sudoku.
I've came up with the definition of the sudoku puzzle in mathematical...

Mar1811 07:23 PM
micromass

1 
967 
I have the following equation:
(k(x)*g(x)')'=p*g(x)
where
k(x) = k(x+T)  k(x) is a known periodical function...

Mar1010 07:47 AM
simplex

1 
940 
i was reading simon singh's the code book. it describes different systems of cryptography. but what i wanted to know...

Feb606 02:37 AM
murshid_islam

7 
3,743 
I was searching for the definition of localization of a ring .
I came across the definition given at
...

Mar908 05:05 PM
ircdan

1 
1,114 
I was wondering what Q/Z, or the rational numbers modulo the integers. I am struggling to visualize what the cosets...

Apr2209 09:18 PM
zcdfhn

2 
1,175 
I wont to learn the logic behind a determinant, the math isn’t so hard you do that then you do that, you don’t need to...

Sep504 11:00 AM
HallsofIvy

4 
2,399 
You can find many texts and web pages that teach elementary algebra and say they are only dealing with the real...

Mar3111 11:29 AM
coolul007

10 
2,554 
hello.
I'm creating an ifc importer.
I'm creating some simple beam with rotation about X , about Y and about Z....

Mar512 05:26 AM
giuseppe500

0 
693 
This is an interesting type of number series I found. I have no idea if it's good for anything, but somehow it's...

Dec1810 11:39 AM
alphachapmtl

1 
1,913 
hello, i've been reading some proofs and in keep finding this same argument tyo prove that a linear map is injective...

Dec1807 06:10 AM
HallsofIvy

1 
1,826 
I saw a picture of what it might look like when I was researching it, but I'm confused about something. The picture's...

Mar2613 07:44 PM
LastTimelord

0 
515 
I've just come across oneforms for the first time. Everything I read makes them sound exactly like dual vectors, but...

Nov105 11:01 AM
mathwonk

25 
3,498 
This is crazy. I have no idea what the textbook is saying at the end.
So far, so good. Then this flies at me...

Oct1810 07:53 PM
moe darklight

2 
1,397 
So I've been working through some algebraic number theory and there is a problem asking me to describe the ideals in...

Jun509 10:08 AM
sidm

0 
1,581 
For what values does \mathbb{Z} have unique factorization?
I know Kummer shown that \zeta being a 23rd root of...

Aug1207 10:51 AM
CRGreathouse

6 
1,892 
Hello
I need your help please.
I have a block matrix P=, which is inversable.
if f belongs to the ideal of the...

Jun614 05:48 AM
Erland

1 
1,231 
A vector can be expressed by a column matrix or by a row matrix, however is preferably use the column matrix for...

Mar414 04:52 PM
Jhenrique

2 
544 
Hi,
This has came up in a proof I'm going through, and need some guidance.
The proposition is that if R is a...

Mar511 04:12 PM
mathwonk

1 
722 
Is an ideal always a linear space?
I'm reading a proof, where the author is essentially saying: (1) since x is in...

Feb1511 11:25 AM
Landau

2 
801 
Can anyone explain ideals and polynomial rings i.e. definitions, examples, the most important theorems, etc.?

Apr2412 09:42 PM
glebovg

11 
1,909 
Do all rings have to be generated by ideals? Or can some rings come without ideals?
Can some elements in rings be...

Feb1508 02:10 AM
Emmanuel114

2 
1,518 