[sage-support] Re: Solving multivariate polynomial systems over GF(2)

2009-08-01 Thread john_perry_usm
Raphael, > Also, I read back in April that there was a plan to implement > Faugere's F4 algorithm. As the systems I want to solve are very large, > I would be particularly interested in that or any related tools that > are in development. (Anyone working on an XL variant?) There is some work bei

[sage-support] Re: Solving multivariate polynomial systems over GF(2)

2009-08-01 Thread lesshaste
Thanks very much for the reply. > Finally, for solving you should use a lexicographical term ordering: > > sage: R. = > BooleanPolynomialRing(order='lex') > sage: I=(a111 * b111 * c111 + a112 * b112 * c112 - 1 , a111 * b211 * c111 + > : a112 * b212 * c112 - 0 , a121 * b111 * c111 + a122 * b11

[sage-support] Problem with Sage 4.1 installation on Ubuntu 8.04

2009-08-01 Thread wom
Hi, I have been trying to install sage4.1 on ubuntu 8.04 by following the steps described in the readme file, i.e. I downloaded the source code , unzipped it to the subdirectory sage/sage-4.1 in my home directory, and started "make" from there. This has ended up in the following error (trailing

[sage-support] Re: Problem using mwrank

2009-08-01 Thread John Cremona
I'm on holiday but will look into this when I can. John Cremona (author of mwrank, but not of the Sage/msrank interface ;)) On Jul 31, 6:48 pm, cronopio wrote: > I am using Sage Version 4.1, Release Date: 2009-07-09 on an iMac Intel > core 2 duo running Mac OS X 10.5.7 to compute the rank of a

[sage-support] Re: Solving multivariate polynomial systems over GF(2)

2009-08-01 Thread Simon King
Hi Martin, On Aug 1, 4:09 pm, Martin Albrecht wrote: > sage: R. = > BooleanPolynomialRing(order='lex') > sage: I=(a111 * b111 * c111 + a112 * b112 * c112 - 1 , a111 * b211 * c111 + > : a112 * b212 * c112 - 0 , a121 * b111 * c111 + a122 * b112 * c112 , > : a121 * b211 * c111 + a122 * b212

[sage-support] Re: Solving multivariate polynomial systems over GF(2)

2009-08-01 Thread Martin Albrecht
On Monday 27 July 2009, lesshaste wrote: > I am new to sage and am attempting to solve systems of multivariate > polys over GF(2). My first attempt with a small example is > > R.=GF(2)[] > I=(a111 * b111 * c111 + a112 * b112 * c112 - 1 , a111 * b211 * c111 + > a112 * b212 * c112 - 0 , a121 * b111

[sage-support] Problem with integration

2009-08-01 Thread Mani chandra
Hi, Attached is the code. x = var('x') def f(x): if (x > 0): return x**2 elif (x <= 0): return -x**2 f(x).integrate(x, 0, 10) output: Traceback (most recent call last): File "", line 1, in File "/home/mc/.sage/sage_notebook/worksheets/admin/2/code/58.py", line 14,