Math

Getting help with Time Series questions -- Garch etc.
I have been looking at some versions of Garch time series modelling, and asking questions. However, no one responds to my posts, presumably because there's a shortage of knowledgeable readers. I have tried sci.math and sci.stats.math and have posted on talkstats.com Can anyone give advice as to how I can get h... 12 Feb 2010 02:14

Solving cubic functions?
Are the formulae for findin the roots of cubic equations on Wikipedia correct? I've been through it over and over, and simply don't get roots. I've gone to the original source, which is: http://planetmath.org/?op=getobj&from=objects&name=CubicFormula Just looking at the first equation to calculate r1, then if ... 26 Jan 2010 18:56

Axiom of Regularity.
Hi all, Is the following axiom equivalent to the axiom of Regularity? Axiom: For all x ( For all y (y e TC(x) -> ~ y e TC(y)) & For all y (y e TC(x) -> 0 e TC(y)) ). were "TC" stands for "Transitive closure" defined in the standard manner, and "0" stands for the empty set. Mor... 17 Jan 2010 10:33

Diophantine equation y^2=x^3-3
Hello, Diophantine equation y^2=x^3-3 can have only finitely many solutions. Unfortunately, Z[sqrt{-3}] is not UFD so one cannot use unique factorization to obtain it's solutions. Nevertheless, I got that it has no solutions but am unsure about the correctness of my method and therefor the result. Can someone tell... 14 Jan 2010 15:49

Helmholtz equation and the Maximum Principle
hi, I am dealing with a numerical method to solve the Helmholtz equation. As far as I know it is a second order elliptic PDE. I would like to know, if the Maximum Principle (or Boundary Maximum Principle) holds for the Helmholtz eq., or where can I find explicit literature about it. thx, t. ... 12 Jan 2010 14:05

Aleph_0 ^ Aleph_0
Hello, How much is Aleph_0 ^ Aleph_0? Is it equal to Aleph_1? Thanks in advance. ... 13 Jan 2010 15:28

why Peano Axioms never had Frontview & Backview #291 CorrectingMath
Peter Webb wrote: "Archimedes Plutonium" <plutonium.archimedes(a)gmail.com> wrote in message news:b85f153a-add6-4dd8-af93-48623331ab11(a)o28g2000yqh.googlegroups.com... So here I am in front of a University symposium or a podium of a High School and lecturing the flaws of Peano axioms and their futur... 12 Jan 2010 08:10

Sum of three cubes
> > Is there a solution to the equation a^3+b^3+c^3=d^3 in integer numbers, except of (3,4,5,6)? Yes. For example, 1^3 + 6^3 + 8^3 = 9^3. Not to mention "Ramanujan's taxi" 12^3 = 10^3 + 9^3 + (-1)^3 ____________________________________ I prefer to believe in things that work whether I believe in... 12 Jan 2010 08:11

PUSHPAK VIMAAN - BHARAT'S ANCIENT SPACECRAFT (Was: Re: Answering Just Me...)
In article <4b4ba632$0$5363$bbae4d71(a)news.suddenlink.net>, "harmony" <aka(a)hotmail.com> posted: "Arindam Banerjee" <adda1234(a)bigpond.com> wrote in message news:_Cc2n.459$pv.441(a)news-server.bigpond.net.au... Cleaning up the post a bit [BLANK SPACE] I see that Arindam's post is as de... 11 Jan 2010 18:46

Sum of three cubes
Hi, Is there a solution to the equation a^3+b^3+c^3=d^3 in integer numbers, except of (3,4,5,6)? Thanks, Nebez ... 12 Jan 2010 08:10