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

Feb2313 09:24 AM
micromass

1 
30,541 
So i have 3 vectors:
a=
b=
c=
How do I calculate the L in order to make these vecotrs linearly dependent?
...

Oct2411 12:49 PM
gotmejerry

3 
603 
\frac{d}{dx}f(x)=\frac{d}{dx}
how to get this derivative, what is the answer? is there textbook describe it?

Oct2411 09:39 AM
HallsofIvy

3 
944 
Hi,
Does anybody know how to construct a DFT matrix for the algebra ℂ, where S3 is the symmetry group of a triangle...

Oct2411 03:58 AM
som76

0 
1,040 
(At least, I think it's simple.)
Disclaimer: I'm approaching this subject from the vantage point of a chemist, so...

Oct2311 04:11 PM
lavinia

1 
869 
When studying complex numbers/vectors/functions and so forth you constantly encounter the idea of an inner product of...

Oct2311 10:17 AM
Fredrik

3 
1,013 
Hi, I'll get right to it:
1. Why is finding the cycle important in the Pollard rho factorization method? Is it so...

Oct2211 07:51 PM
MackTuesday

0 
1,793 
In my lecture notes my prof used the eigenvalue c= 1 + i and ended up with the matrix with (5 3+i) as row 1, and the...

Oct2211 01:21 PM
SeannyBoi71

5 
1,416 
If we have a matrix M with a kernel, in many cases there exists a projection operator P onto the kernel of M...

Oct2211 04:20 AM
tmatrix

2 
1,669 
Hello, I tried to figure out what is the maximum count of arithmetic operation (*,:,+,) need for gauss elimination...

Oct2111 06:54 AM
Deveno

1 
987 
I'm looking for help to this problem. Here is my attempt:
I being the identity matrix and B^(1) being B to the...

Oct2011 11:07 PM
sam0617

2 
1,656 
Is it possible for two planes to meet in a point instead of in a line?

Oct2011 10:53 PM
chiro

3 
1,048 
Hello 
I have some reference object R (e.g. a protein), and I've got two transformations t1 and t2 (e.g. a...

Oct2011 08:04 PM
nitroamos

1 
661 
Definition of notation:
First let x for this problem denote the elementart tensor product.
Then let (AxB) acting on...

Oct2011 07:55 PM
carlosgrahm

0 
571 
Hi there, this is my first post here so I'm sorry if this is in the wrong place, asked before, standard newbie...

Oct2011 06:12 PM
D H

34 
5,450 
I'm currently reading Durbin's Modern Algebra, and I have a question about the positive set in ordered integral...

Oct2011 04:56 PM
Erland

1 
1,279 
Hi,
I'm struggling with the following:
I have a colored graph, and I used Bliss to find the generators group for the...

Oct2011 01:19 PM
matt42

0 
639 
A few classmates and I need help with some proofs. Our test is in a few days, and we can't seem to figure out these...

Oct2011 08:16 AM
wisvuze

7 
2,645 
Why is it that a metric space (X,d) always has two clopen subsets; namely {0}, and X itself?
Rudin calls it...

Oct1911 10:19 PM
Deveno

3 
1,673 
I'm slightly confused about why complex numbers are required to find all n roots of a number. Is it specifically...

Oct1911 08:35 PM
tut_einstein

7 
2,599 
From Herstein's Abstract Algebra. Section 2.7 #7
If φ is a homomorphism of G onto G' and N ◅ G, show that φ(N)...

Oct1911 02:57 AM
Deveno

2 
1,060 
If anyone has any links to good introductory information about matrix completions, please post them here for me. ...

Oct1811 08:35 PM
shelovesmath

0 
493 
Hi guys!
I need to solve a matrix. I have 3 equations, 3 unknowns, straightforward stuff. And I know it's...

Oct1811 07:14 PM
jasonRF

3 
1,630 
Hello everyone,
I am currently taking an introductory course in linear algebra. I am begining to struggle with...

Oct1811 06:07 PM
mathwonk

1 
764 
Let F_n and F_n+1 be successive Fibonnaci numbers. Then (F_n+1)/(F_n)  Phi  < 1/(2(F_n)^2)
Where Phi is the...

Oct1811 03:14 PM
Matt Benesi

3 
1,714 
Hello everybody,
I would like to know if there are any techniques to handle illconditioned or/and singular...

Oct1811 05:26 AM
D H

1 
1,199 
Hello. I recall from Linear Algebra there being an ultrafast shortcut for finding the eigenvectors of a 2x2 matrix...

Oct1711 03:58 PM
wil3

0 
2,241 
How does knowing that two matrices anticommute AB=BA and that A^2=1 and B^2=1 help me to know how to find the trace...

Oct1711 01:38 PM
I like Serena

16 
2,687 
a,b,c,d\in\mathbb{R^{+}}\;\;,a+b+c+d=1.
Then prove that
\left(...

Oct1711 09:40 AM
wnvl

1 
1,248 
So I have 4 points, one of them has an unknown x coordinate. How would I show that they are coplanar? With 3 points I...

Oct1711 08:47 AM
AlephZero

5 
2,428 
Let F be a field. Let c \in F.
I am trying to show that if
c = f^2 where f\in F], then f\in F.
So I am...

Oct1611 07:59 PM
R.P.F.

1 
733 
I am puzzled by the following infinite product:
Let B > A
A  B = *
= * *
= * * *
etc.

Oct1611 05:30 PM
dodo

7 
1,719 
I need to show that addition and multiplication are welldefined in Z/nZ. So far, I've figured out that I need to work...

Oct1611 04:57 PM
Deveno

1 
1,797 
This thread is concerned with rectangular triangle with one side ( = s) and hypothenuse
(t = 2 s + 1) given and we...

Oct1511 10:40 PM
ramsey2879

7 
4,390 
Let n>2. Where n is integer show that sqrt(n!) is irrational.
I am supposed to use the Chebyshev theorem that for...

Oct1511 06:12 PM
ramsey2879

7 
2,743 
EQUALITY OF ROW AND COLUMN RANK (o'Neil's proof) Is there smt wrong?
...

Oct1411 06:05 PM
mathwonk

1 
1,236 
So, Google recently interviewed one of my friend as an employee candidate.
How many ways can a two by n rectangular...

Oct1411 04:32 PM
AlephZero

9 
2,441 
Now, I can show that if n is prime then Z/Zn is a field
a = a
b = an2
a*b = an1 = 1 (mod n) > Fermat's...

Oct1411 11:45 AM
General_Sax

3 
1,801 
How to calculate following integral?:
{lim}_{t→∞}\int_{0}^{t} \exp (A(ts)) B B^{T} \exp (A^{T}(ts))ds
where...

Oct1411 11:17 AM
lequan

0 
1,623 
Let Q be the quaternion group {1, 1, i, i, j, j, k, k}. Show that the normal subgroup {1, 1, i, i} is the kernal...

Oct1411 10:32 AM
demonelite123

9 
1,896 
While R^1, R^2, ... , R^n comes quite naturally, is it even conceivable to ponder the meaning of R^(n)? Is this...

Oct1411 05:55 AM
Deveno

7 
1,696 