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

Feb2313 09:24 AM
micromass

1 
35,750 
I came across this Proposition in my book, and I know it's something really simple that I'm missing, but I can't seem...

Aug709 08:51 AM
rasmhop

1 
1,464 
Hello,
Problem, let B={a_1,a_2,a_3} be a basis for C^3 defined by a_1=(1,0,1) a_2=(1,1,1) a_3=(2,2,0)
Find the...

Jul2612 03:12 PM
Abuattallah

0 
580 
Hey all. I'm not too sharp on linear algebra. I've done a first year university course on it, but that was a couple...

Jan1011 01:15 PM
hotvette

1 
753 
everything i have to prove seems impossible
then i see it done and it seems so easy
any help on starting a...

Feb2206 04:03 AM
matt grime

7 
1,575 
I don't know if the book or I'm the one is the problem .
Last day, I borrowed a book titled Linear Algebra, 2nd...

Sep2409 05:39 AM
Landau

10 
4,980 
I just finished Differential Equations, and I know how to find eigenvalues/eigenvectors, and I understand how to use...

Mar111 03:19 PM
mathwonk

29 
17,029 
It's like a riddle thinger..
If 9 times 9 is 7
10 times 9 is 9
10 times 8 is 8
8 time 8 is 2
What is 9 times...

Mar2304 01:09 PM
TeV

3 
1,776 
I don't know how to make a thesis, how to present it, and my mathematical expression may be terrible.
But who...

Nov2210 08:35 AM
epsi00

2 
1,197 
i dont get the point of pseudovectors. the only example I ever see is the cross product, and their reasoning is that...

Aug2109 11:47 AM
Jcpaks3

7 
4,102 
Let V be a complex inner product space and T a selfadjoint linear operator on V.
I'm trying to show a + iTa = b +...

Dec1209 01:10 PM
CoachZ

2 
1,171 
I was studying (yet another) number theory problem, described here:
Prove that the equation x^3+y^3+z^3+t^3=1999...

Feb1712 02:58 PM
AntiCrackpot

24 
3,640 
i am puzzled about the method of finding the Im
in one axample i see the method of thaking the column withound the...

Feb908 09:06 AM
transgalactic

0 
1,387 
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 
2,291 
rank(A+B)>=min{rank(A),rank(B)},which holds for allA,B in positive semidefinite matrix

Apr309 09:01 PM
mathsgao

0 
1,040 
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 
6,143 
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 
2,100 
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 
10,827 
Rv=...

Apr3005 03:29 AM
strid

21 
2,262 
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 
2,801 
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 
2,649 
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 
2,723 
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 
1,520 
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 
1,084 
I need help proving if a + a = 0 then a = 0. Thanks!

Jul1304 04:08 PM
mathman

1 
1,451 
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 
1,603 
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 
1,064 
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 
2,663 
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 
2,088 
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 
9,319 
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 
972 
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 
1,136 
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 
978 
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 
945 
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 
3,758 
I was searching for the definition of localization of a ring .
I came across the definition given at
...

Mar908 05:05 PM
ircdan

1 
1,120 
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 
1,188 
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 
2,408 
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 
2,570 
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 
708 
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 
1,921 