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

Feb2313 09:24 AM
micromass

1 
30,452 
I have been long thinking on how one would set up an integral to find the area under a helix (the area between the...

Aug211 06:07 AM
Action_Man

8 
8,039 
I'm going through the proof of Cauchy's Theorem in a text book and I'm stuck on a particular point. I've tried looking...

Aug411 02:59 AM
daveyp225

4 
3,433 
THE PROOF THAT AN ODD PERFECT NUMBER DOES NOT EXIST
Let us firstly suppose that such an odd number (X) member of...

Aug211 03:04 AM
robert80

6 
7,223 
Can anyone please explain the largeness of Graham's number? I tried looking it up in google, but didn't quite...

Aug911 02:05 AM
ranzzz

5 
6,399 
Esteemed Algebraists:
Please help me understand better the definition of a transvection.
Let V be a...

Jul2811 10:28 PM
Bacle

3 
1,646 
Hi,
I have a rotated frame (new matrix, T(x,y, z)) and the original frame (old matrix T(X,Y,Z)). I want to use this...

Aug411 02:11 PM
Rasalhague

3 
2,691 
It's pretty wierd....but i don't understand that why the dot product of two vector quantities is a scalar quantity and...

Aug511 05:41 PM
teejmd

7 
2,614 
if A is a square matrix
Ax = 0 has exactly one solution if and only if Ax = b has at least one solution for every...

Jul2811 07:26 PM
bpet

2 
2,887 
My background in linear algebra is pretty basic: high school math and a first year course about matrix math. Now I'm...

Aug611 11:25 AM
Fredrik

32 
7,949 
Let A be an n x p matrix with real entries and A' be its transpose. Is the column space of A'*A the same as the column...

Jul2911 05:14 PM
MichaelL.

1 
1,549 
Hi,
I encountered the following formula while reading, can anyone prove this:
lcm(a,b)=gcd(a^{1},b^{1})^{1}
...

Jul3011 07:38 AM
agentredlum

59 
8,263 
I defined the angle \theta between x \in \mathbb{R}^k and y \in \mathbb{R}^k in the way that:
\theta = \cos...

Aug311 10:19 PM
zhentil

1 
1,116 
As we know for the average Undergrad attempting to grasp (and understand) these abstract mathematical concepts can be...

Jul2911 09:18 AM
Eynstone

1 
1,753 
Say I have 2 complex (normalized) column vectors x and y in C^N:
The standard dot product <x,y> = x*y (where *...

Jul2911 09:10 AM
wisvuze

1 
917 
Hello,
if B is a positive semi definite matrix, how can you complete the square around B from
x'Bx + x'Cy +...

Jul2911 10:39 AM
tinytim

1 
2,744 
I've been doing some work and I keep running into polynomials of the following form:
P(x,y,z) = ax^2 + by^2 + cz^2...

Jul3111 02:56 PM
Citan Uzuki

9 
2,473 
I'm trying to create a circle in 3D based off of 4 inputs.
Position1
Position2
LineLength1
LineLength2
The...

Jul3011 10:36 PM
I like Serena

14 
1,688 
Is the following theorem true:
Theorem: Suppose a, \, b \in \mathbb{R}^k. If a + b = a + b , then a and ...

Aug411 10:53 PM
matphysik

3 
1,604 
I'm studying the S_n groups and I've been calculating a bunch of compositions of mcycles. I haven't, however, been...

Aug511 09:49 AM
Stephen Tashi

1 
1,769 
I am trying to understand the notions of rank of an RModule, freemodule, basis, etc.
I would like to understand...

Jul3011 06:50 PM
micromass

6 
2,135 
Hello,
I just took ordinary diff eq and I've had calc III and linear algebra, but I'm worried about taking Modern...

Aug211 10:33 PM
Robert1986

9 
2,969 
I think this is a pretty simple question. I need a transformation that will take a Column vector e.g.: <a,b,c> and...

Aug411 10:35 PM
JG89

3 
1,967 
Hello,
If I have block matrices A,B,C and D all of which are non singular would this relationship hold; my main...

Aug111 03:13 PM
EmmaSaunders1

2 
1,509 
A natural integer N can be written as x mod p, for instance:
N... 1 2 3 4 5 6 7 8 9 10 11 12
p=2 1...

Aug211 01:37 AM
PhysicForumz

0 
1,572 
I am learning about tensors.
Is gαβAβ the same as Aβgαβ ?
Thanks for any help.

Aug411 07:36 AM
Rasalhague

10 
1,399 
Hello,
I'm wondering if this is true, or if anyone has seen this before:
Let q, t be coprime integers. Then...

Aug411 04:20 AM
burritoloco

2 
2,831 
Hi, All:
Please forgive my ignorance here: let G be an infinite group, and let H be
a subgroup of G of finite...

Aug611 03:53 PM
zhentil

8 
2,785 
Hi, my problem is simple enough to write down but (to me) seems quite difficult to solve.
My equation is as follows...

Aug511 10:50 AM
rasmhop

1 
1,513 
Hi,
I have two diagonal matrixes (rotated and origin), how can I calculate the rotation matrix between these two...

Aug311 07:15 PM
faribataghavi

0 
1,277 
hello,
I'm examinating the theorem of power series, specially taylor series
I know a function f(x) can be written...

Aug411 04:41 AM
vrc

2 
832 
I have enrolled for a distance learning progaramme from IGNOU(big mistake!).There is a paper on linear algebra.The...

Aug511 08:38 PM
achuthan1988

11 
3,308 
Hi, I'm new to linear algebra. I'm pretty good at doing exercises with matrices and stuff but even though I've been...

Aug1011 01:12 AM
thecaptain90

6 
3,118 
Hi, as no unique unique analytical solution exists to my problem (as another poster pointed out), I have taken to...

Aug811 12:49 PM
Klandhee

8 
1,957 
In an integral domain, I found that the number of maximal ideals in a Notherian ring containing a particular element...

Aug611 05:07 AM
daveyp225

2 
1,182 
Let R be a commutative ring with 1. If there exists a nonzero Rmodule M such that every submodule of M is free, then...

Aug911 10:42 PM
daveyp225

6 
1,985 
Hi.
I have a few simple questions.
(< sorry, please click this image.)
1. What does the notation in the red...

Aug711 08:31 PM
lishrimp

2 
2,375 
I have read that we do not know if there are an infinite number of Fibonacci primes. So far, no one has produced a...

Aug911 03:47 PM
ramsey2879

6 
3,051 
I'm trying to make sense of two different definitions of an algebra over a ring. The definitions are as follows:
If...

Aug911 12:32 PM
Kreizhn

7 
1,385 
I have a matrix D (it happens to be in R^(nxm) where n>>m, but I don't think that is relevant at this point). I also...

Aug811 07:20 PM
I like Serena

1 
1,739 
Just a quick question. What areas of mathematics would I have to study to understand Wiles' proof? I know his proof...

Aug911 09:24 AM
micromass

1 
2,021 