#12876: Fix element and parent classes of Hom categories to be abstract, and
simplify the Hom logic.
-------------------------------------+--------------------------------------
       Reporter:  nthiery            |         Owner:  nthiery                  
     
           Type:  enhancement        |        Status:  needs_work               
     
       Priority:  major              |     Milestone:  sage-5.1                 
     
      Component:  categories         |    Resolution:                           
     
       Keywords:  categories, Hom    |   Work issues:  Fix ring_refcount_dict 
problem
Report Upstream:  N/A                |     Reviewers:  Simon King               
     
        Authors:  Nicolas M. ThiƩry  |     Merged in:                           
     
   Dependencies:  #12875, #12877     |      Stopgaps:                           
     
-------------------------------------+--------------------------------------

Comment (by SimonKing):

 PS: I am just attempting a rebase, to see whether #11521 fixes the
 ring_refcount_dict problem.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12876#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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