Gfan does a lot more than compute the Groebner fan.  My main use for
it is computing tropical prevarieties.  Anders Jensen keeps improving
gfan, and in fact our interface to it doesn't wrap all the current
functionality.  I think it would be quite a job to replace it.

-Marshall

On Oct 19, 11:53 am, Volker Braun <vbraun.n...@gmail.com> wrote:
> gfan definitely depends on cddlib.
>
> Unless it is somehow broken I would keep sage.geometry.groebner_fan
> and the gfan spkg for now. In the long term we should rewrite
> sage.geometry.groebner_fan to work with the new Fan class from the
> toric geometry stuff. And I think it would be easy enough to take
> Singular's groebner fan code (which uses polymake internally) and
> replace its use of cddlib and TOPCOM with Sage's Cone/Fan and
> triangulation code. Then we wouldn't need gfan any more...

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