On 02/13/12 11:18 AM, Jason Grout wrote:
On 2/13/12 4:17 AM, Dr. David Kirkby wrote:
Since some of packages will not have the "or later version" added into
the license, we can't distribute Sage as GPL 3 or even "GPL 2 or any
later version", since some of the components don't have the "or any
later version".
Which packages are those? I thought we were being really careful to not
include any packages that were GPLv2 only in the base, standard
distribution of Sage?
Or are you just imagining that there probably is such a package?
Thanks,
Jason
First one I find is gfan. This is SPKG.txt:
= gfan =
== Description ==
From http://www.math.tu-berlin.de/~jensen/software/gfan/gfan.html:
Gfan is a software package for computing Groebner fans and tropical varieties.
These are polyhedral fans associated to polynomial ideals. The maximal cones
of a Groebner fan are in bijection with the marked reduced Groebner bases of
its defining ideal. The software computes all marked reduced Groebner bases of
an ideal. Their union is a universal Groebner basis. The tropical variety of a
polynomial ideal is a certain subcomplex of the Groebner fan. Gfan contains
algorithms for computing this complex for general ideals and specialized
algorithms for tropical curves, tropical hypersurfaces and tropical varieties
of prime ideals. In addition to the above core functions the package contains
many tools which are useful in the study of Groebner bases, initial ideals and
tropical geometry.
== License ==
* GPL v2
This is COPYING in the source.
drkirkby@hawk:~/sage-5.0.beta3/spkg/standard/gfan-0.4plus.p1$ more src/COPYING
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
675 Mass Ave, Cambridge, MA 02139, USA
Dave
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