#11599: Wrap fan moriphism in toric morphism
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   Reporter:  vbraun              |          Owner:  AlexGhitza
       Type:  enhancement         |         Status:  new       
   Priority:  major               |      Milestone:  sage-4.7.2
  Component:  algebraic geometry  |       Keywords:            
Work_issues:                      |       Upstream:  N/A       
   Reviewer:                      |         Author:            
     Merged:                      |   Dependencies:            
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Old description:

> Since we have the very nice fan morphism class, we should use it to
> define toric morphisms of toric varieties.

New description:

 Since we have the very nice fan morphism class, we should use it to define
 toric morphisms of toric varieties.

 A big part of the patch is porting the scheme morphisms / hom sets to new-
 style parents and coercion. Categories should be better, too. Fixes #7946
 as a side effect.

 Apply:
   * [attachment:trac_11599_no_circular_imports.py]
   * [attachment:trac_11599_homset_new_coercion_model.patch]

--

Comment(by vbraun):

 Ok so far no new functionality. But I think now the groundwork is done and
 we can actually do some work on top of it. I'm sorry for the giant patch
 :-)

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11599#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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