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  Inequalities - quadratic         


Author: Ramkumar Menon
Date: Jul 8, 2008 23:59

Hi Gurus,

Here is a question on inequalities. I hope some one will be able to
help me with this.

x > 0, p > 0, p = 4*a*b, where a and b are two positive integers.

find range of x for
x^2 - x > p

Please help!

Ram
no comments
  Question on Berry Phase         


Author: Lou Pagnucco
Date: Jul 8, 2008 23:15

I have a question on Berry phase for this very simple example:

Define D as the 4X4 diagonal 0-1 matrix

[1000]
[0000]
[0010]
[0000]

Define M as the symmetric 4X4 0-1 matrix

[0001]
[0011]
[0100]
[1100]

Define the parameterized Hamiltonian

H(x,y) = (x^2+y^2)*M + D (x,y real)

The maximum eigenvalue of H(x,y) has only one degeneracy at
(x,y) = (0,0)

Let P(t) be the circular path (sin(t),cos(t)) [0<=t<=2*pi].

The maximum eigenvalue of H on P(t) is always 2 and has an
eigenvector = |1,1,1,1>/2 independent of t.
The Hamiltonian on the path H(sin(t),cos(t)) is constant.
Show full article (0.93Kb)
1 Comment
  ask a math site         


Author: kuen
Date: Jul 8, 2008 23:11

Hi:
I had a homepage as below before,but now I can't
find it.
http://math.smsu.edu/%%7Eles/POTW.html
Anyone knows where the site can be?
Thanks a lot.
Kuen
4 Comments
  Inequalities - quadratic         


Author: Ramkumar Menon
Date: Jul 8, 2008 22:56

Gurus,

I dont seem to be good at Math anymore - unfortunately I require a
solution critical to a problem I am facing.

What is the range of x for

x^2 - p < x

where p > 0 and x > 0.

Please help!

Ram
6 Comments
  AN: GuruGram #94 newly available for free download         


Author: Don Lancaster
Date: Jul 8, 2008 20:28

... as http://www.tinaja.com/glib/nucalc23.pdf

It is on an expanded and updated magic sinewave calculator.

Sorcecode available as http://www.tinaja.com/glib/nucalc23.psl
Additional GuruGrams at http://www.tinaja.com/gurgrm01.asp
Additional magic sinewave info at http://www.tinaja.com/magsn01.asp

--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com
no comments
  Goldbach conjecture         


Author: vincent64
Date: Jul 8, 2008 19:08

no comments
  Source code implementable set theory         


Author: jonas.thornvall
Date: Jul 8, 2008 16:14

Where can i find the source code to Han De Bruijns implementable set
theory.
6 Comments
  Where is the source code to han de bruijns implementable set logic?         


Author: jonas.thornvall
Date: Jul 8, 2008 15:51

Where is the source code to han de bruijns implementable set logic?
1 Comment
  Re: a simple iteration -> 1,39865929053...         


Author: amy666
Date: Jul 8, 2008 15:25

> perhaps 1.3986... can be given by an integral ??
>
> regards
>
> tommy1729

or an analogue of finding the golden mean

something like

1 = exp(x) - exp(x^2) ??
1 Comment
  Re: a conjecture based on Euler pol. and the Little Fermat Theorem         


Author: amy666
Date: Jul 8, 2008 15:17

simon plouffe wrote :
> I had this idea one night a while ago,
>
> if k = n*n - n + 41 and if 2^(k-1) = 1 mod k then
> k is prime.
>
> It seems to work all the time, I verified for n up to
> 500,000,000.
>
> In other words : n*n - n + 41 is never a 2-psp, a
> pseudo-prime
> in base 2 (that is the conjecture).

what if k equals a polynomial that does not have coefficients larger than 1 ?

***
tomic polynomial:

all coefficients are E [-1,0,1]

none of its zero's is a root of unity / [-1,1]

zero is not a root of the polynomial
***
Show full article (1.97Kb)
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