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

Feb2313 09:24 AM
micromass

1 
30,435 
Hi, I was wondering whether the following is true at all. The first isomorphism theorem gives us a relation between a...

Jul1013 06:20 PM
burritoloco

12 
568 
I have two real symmetric matrices A and B with the following additional properties. I would like to know how the...

Jul1013 03:39 PM
Office_Shredder

5 
500 
I have been looking how to use the Levenberg Marqurdt algorithm for minimizing the errors of two functions at the same...

Jul1013 01:53 PM
I like Serena

3 
645 
I am developing a code that uses Newton's method to optimize a functional W:ℝ6→ℝ
Because the functional is poorly...

Jul1013 10:53 AM
brunnels

0 
489 
Hello. I have been looking into group theory for its applications to subject I am studying. I am not a mathematician...

Jul913 06:11 PM
Stephen Tashi

3 
600 
I am doing linear algebra and want to fully understand it, not just pass the class. I was recently taught matrix...

Jul613 11:27 AM
Fredrik

4 
690 
Can GaussSeidel Iteration be incorporated in the Simplex method algorithm? Thanks.

Jul613 03:59 AM
maistral

0 
523 
If I have two square nonnegative primitive matrices where the PerronFrobenius Theorem applies how would I calculate...

Jul413 09:01 PM
Simon Bridge

2 
407 
Please I have read texts about changing the bases of numbers but still I have difficulties in
doing, may s'body...

Jul413 07:48 AM
HallsofIvy

5 
703 
Perhaps a silly question. I have a vector:
a=^T
that I want to turn into a diagonal matrix. Is there an...

Jul313 03:46 PM
D H

8 
18,134 
Hello everyone:
I have some question using the FFT in matlab for data interpolating. I don't know what the relation...

Jul313 02:29 PM
mathman

1 
393 
Okay, So I just got done reading and rereading Chapter one of Introductory Real Analysis by Andrei Kolmogorov and...

Jul313 04:45 AM
Tenshou

10 
510 
I read that in string theory the Virasoro algebra contains an ##SL(2,R)## subalgebra that is generated by ##L_{1},...

Jul213 03:03 PM
dextercioby

3 
380 
Hi,
I'v got a problem on Chapter 10 of Georgi's "Lie Algebras in Particle Physics".
I want to prove
u^i v^j_k...

Jul113 06:03 PM
Wonchu

0 
358 
Hello ,
I Have two matrices A= B=
Lines are separeted with ";"
It is asked to find a nonsingular...

Jul113 03:36 PM
mihalisla

0 
358 
It is well known that the approximation error of the SVD is
\left\ \textbf{A}\textbf{A}_{\rm SVD} \right\ = σ_k,...

Jul113 04:14 AM
yiorgos

0 
379 
I am looking for a transformation that relates a matrix product with a matrix addition, e.g.
AB = PA + QB
Is there...

Jul113 04:02 AM
yiorgos

4 
466 
There is a technical distinction between a vector and the coordinates of a vector. Are projective (also called...

Jun3013 02:29 PM
Bacle2

2 
449 
I have just found links to a few articles discussing the proof of the twin prime conjecture by Yitang Zhang, a once...

Jun3013 08:26 AM
StatGuy2000

2 
581 
## x_1=2uv \\x_2= u+v \\ x_3=vu\\##
So the book has this arranged in a 2by3 matrix below
##
\left
##
Then...

Jun3013 01:49 AM
Simon Bridge

9 
684 
The Fourier series can be used to represent an arbitrary function within the interval from  π to + π even though...

Jun2813 03:39 PM
tinytim

1 
379 
Hello,
Something I have some time wondering and still couldn't find the answer is to this question: if there is...

Jun2813 12:41 AM
jbunniii

4 
536 
is this bigger than grahams number, i again "accidentaly" checked grahams number out and felt dumb then lost/forgot...

Jun2613 08:38 PM
Jheavner724

23 
13,641 
In a linear regression with 1 independent variable, if X is always the same (let's call I am unlucky), but Y present...

Jun2613 03:57 PM
Number Nine

2 
399 
According to wikipedia, the affine group preserves paralellness between lines, and preserves the ratios of distances...

Jun2613 01:57 PM
madness

0 
287 
Hi,
I have been learning about tensor products from Dummit and Foote's Abstract Algebra and I'm a little confused. I...

Jun2513 10:57 PM
Bacle2

2 
966 
Can the arithmetic mean of a data set of complex numbers be calculated?
if so, can the method be demonstrated?

Jun2513 12:59 PM
D H

19 
1,829 
I've been reading about principal components and residual matrixs.
It's my understanding if you used every...

Jun2413 07:16 AM
Jrb599

4 
476 
I am entranced. I mean There are so many thing which seem to deal with skew symmetry, like the skew antisymmetric...

Jun2313 04:34 PM
Tenshou

7 
444 
Hi there.
I would like to learn more, if any, on interesting applications of Euclidean rings both in mathematics,...

Jun2313 04:33 PM
jamesb1

0 
344 
For another thread http://www.physicsforums.com/showthread.php?p=4420542 , I want to give simple motivations for the...

Jun2313 01:19 AM
Stephen Tashi

3 
413 
Hi Guys,
I have just started studying about this field.
Can you give me some ideas about some best eigen value...

Jun2213 08:50 PM
lurflurf

1 
355 
Hi,
I am trying to understand how I find the error in linear regression, and what to do with it. I am using linear...

Jun2213 11:56 AM
Stephen Tashi

7 
576 
There are lots of examples of numbers where "is it a rational number" has been an open question for a while before...

Jun2113 01:54 PM
Office_Shredder

0 
355 
I am having problems showing the following:
##f## and ##g## are two linearly independent functions in ##E## and...

Jun2113 02:06 AM
Tenshou

2 
605 
I have some reason to believe that
\det(\textrm{id} + AB) = \det(\textrm{id} + BA)
is true even when AB and...

Jun2013 10:47 PM
jostpuur

2 
417 
Can someone please explain the below proof in more detail?...

Jun2013 08:04 AM
DrClaude

12 
874 
In my work I've encountered equations of the type:
(Ax).*(Bx) + Cx = d
Where A,B and C are nonunitary square...

Jun1813 03:28 PM
DuncanM

3 
480 
I have sets of 2d vectors to be transformed by an augmented matrix A that performs an affine transform.
Matrix A can...

Jun1813 12:24 PM
atrus_ovis

6 
726 
I've been studying the proof of the MazurUlam theorem in the pdf linked to at the end of this Wikipedia article. I'm...

Jun1713 09:59 PM
micromass

7 
699 