sci.math Google Group

Compendium on Mathematical Programming

2008-12-02T11:03:35Z

Could anyone recommend a _results_ _oriented_ compendium on
mathematical programming? I am especially interested in a list of
program classes that can be solved in polynomial time, ideally
together with references where to find the algorithms or even
implementations.
There exist _huge_ books on, e.g., convex programming. However, I

luxury Products - www.cicigogo.cn

2008-12-02T08:31:14Z

hi
We are supplier in china Footwear Apparel Handbags Jeans&Pants Cap
Accessory(world famous brand)
1) Top quality, reasonable price, safe shipping, and best service
2) Sport shoes for men, women and kids with all sizes available
3) Sport shoes with different colors and styles available in stock
4) The material and size can be required to make in accordance with

Oxyshopping.com introduce gifts for Christmas shopping

2008-12-02T05:56:48Z

Christmas shopping has become easy through oxyshopping.com.
Oxyshopping has brought new shopping list especially for those who
love to shop during Christmas.
Dec 01, 2008. Bells of Christmas are about to ring and it will soon
spread to all over the world. And, Christmas is the time when you are
involved in tons of shopping. Now, you can just do tons and tons of

Expander graphs with minimal eigenvalue gap

2008-12-02T05:31:48Z

Have the d-regular graphs with a given edge expansion constant
with minimal gap between the largest eigenvalue (=d) and the
second largest eigenvalue been characterized?
Are they constructible?

Some doubts (basic field theory)

2008-12-02T05:13:50Z

Let K,E be fields. Then every homomorphism f: K-> E is injective.
Isn't this false because for instance
the trivial homomorphism f(x) = 0 for all x in K has kernel equal K so
its not an injection. Although
I think the statement is correct if we state it as follows: every
*NONTRIVIAL* homomorphism of fields is

JSH: Normalization issue?

2008-12-02T05:12:54Z

Here's a case where normalization opens up a huge argument where a
math journal has died over this thing.
I have the special mathematical construction:
7*(175x^2 - 15x + 2) = (5a_1(x) + 7)(5a_2(x)+ 7)
where the a's are roots of
a^2 - (7x-1)a + (49x^2 - 14x) = 0.
(If you doubt the correctness of the construct, multiply everything

Question about construction of vectors

2008-12-02T04:30:32Z

Question:
Let's take a vector of some sort, of some number of dimension, say, (A,
B, C, D), of four dimensions. Let's even say this vector transforms as
such under SU(4), though one can think of this vector more generally as
well.
Clearly, one can form the scalar product A^2+ B^2+C^2+D^2.
Clearly, one can also form a 4x4 tensor which has AB, AC, AD, BC, BD,

T&T

2008-12-02T04:19:31Z

S.K.22.05.2008."Pölyttäjien täyskato uhkaa viedä kesän marjat. Omenapuut ja
herukat kukkivat monin paikoin jo täysillä, mutta puutarhoissa on hiljaista.
Pölyttäjiä ei ole liikkeellä. Sään lämpeneminenkään ei lupaa helpotusta,
sillä luonnonvaraisten pölyttäjien kannat ovat romahtaneet lähes

Exponential Series convergence problem?

2008-12-02T03:12:05Z

Does there exist a sequence {a_n} such at:
S=sum(|a_n|) converges and S=sum(|a_n|^p)diverges for any p satisfying
0.5<p<1. Thanks.

Laplace transform - please see if my solution is on the right track

2008-12-02T02:49:48Z

i need to find the following laplace transfrom:
f(x) = x sinx e^(x)
here's what i have so far:
L {f(x)} = L {x sinx e^(x)} = L{x sinx} L {e^(x)} = 2s / [(s^2 + 1)^2]
multiplied by 1/s - 1
then its just a matter of simple arithmetic.
comments are very much appreciated.

proper credit was added to site

2008-12-02T02:38:18Z

Hello,
after a brief exchange with Jon Borwein, my name was added
to the site in question :
[link]
This is all I asked, I am satisfied with the proposed solution.
Je remercie Jon Borwein pour s'être montré compréhensif
sur ce sujet.
****************************** ******************************

An exact 1-D integration challenge - 61 - (exp)

2008-12-02T00:56:58Z

Hello,
int(exp(2*sin(z))*(exp(4*sin(z ))*(2*cos(cos(z))^2-1
)+2*exp(2*sin(z))+2*cos(cos(z) )^2-1)/(exp(4*sin(z))
+2*exp(2*sin(z))*(2*cos(cos(z) )^2-1)+1)^2, z=0..Pi)
?
Cheers,
Vladimir Bondarenko
Co-founder, CEO, Mathematical Director
[link] Cyber Tester Ltd.

Student Brings Back Bronze From 5th Intl Mathematics And Science Olympiad (BruDirect.com)

2008-12-01T09:12:43Z

[link]

Human beings re-discover some of the defects discovered by the VM machine

2008-12-01T23:45:16Z

[link]
These and many other MATLAB defects have been
logged by the VM machine about 1 month ago.
Cheers,
Vladimir Bondarenko
Co-founder, CEO, Mathematical Director
[link] Cyber Tester Ltd.

image of an irreducible scheme

2008-12-01T23:01:05Z

Hi
is it true that the image of an irreducible scheme X under a morphism
of schemes f:X->Y is contained in an irreducible component of Y, i.e.
does each morphism of schemes f:X->Y with X irreducible factorizes as
X->Y_i--inclusion-->Y where Y_i is a component of Y?
Yours
Alex