Hi Alex,
On Tue, 17 Mar 2009 16:01:14 -0700 (PDT)
Alex Raichev <tortoise.s...@gmail.com> wrote:
>
> It seems my math projects keep breaking things...
Thanks for taking the time to use and test pynac. As you might have
read here already, pynac is supposed to be the new backend for
symbolics in Sage. It's only experimental for now, and it needs this
testing really badly before it can go prime time. So please keep
sending these reports. :)
> ----------------------------------------------------------------------
> | Sage Version 3.4, Release Date: 2009-03-11 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: var('n,x',ns=1)
> (n, x)
> sage: g= (n+1)/x^n - n/x^n
> sage: g.collect_common_factors()
> /Applications/sage/local/bin/sage-sage: line 197: 1876 Segmentation
> fault sage-ipython "$@" -i
I guess this is caused by the recent changes in Sage's definition of
gcd for rational numbers, which in turn broke the gcd in pynac. I
couldn't find a quick workaround at the moment.
Making pynac use the gcd for multivariate polynomials in Sage, provided
by Singular's libfactory, was already on my todo list for the next
release of pynac, which should be out by next week.
Thanks.
Cheers,
Burcin
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