#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_review                                                                    
         
       Priority:  major                                   |     Milestone:  
sage-5.4                                                                        
         
      Component:  categories                              |    Resolution:      
                                                                                
     
       Keywords:  categories, Hom                         |   Work issues:  
Understand why the crash in infinite_polynomial_ring is not fixed and what 
happens with r
Report Upstream:  N/A                                     |     Reviewers:  
Simon King                                                                      
         
        Authors:  Nicolas M. ThiƩry                       |     Merged in:      
                                                                                
     
   Dependencies:  #11521, #12215, #12313, #13412. #13145  |      Stopgaps:      
                                                                                
     
----------------------------------------------------------+-----------------

Comment (by SimonKing):

 Now I am totally puzzled. On bsd.math, admittedly with the new GAP 4.5.5
 spkg, I get
 {{{
 The following tests failed:

         sage -t  -force_lib
 devel/sage/sage/combinat/combinatorial_algebra.py # 4 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/partition.py # 3
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/classical.py # 11
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/dual.py # 89
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/elementary.py # 9
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/hall_littlewood.py
 # 61 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/homogeneous.py # 9
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/jack.py # 68
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/kschur.py # 15
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/llt.py # 50
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/monomial.py # 16
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/ns_macdonald.py #
 2 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/macdonald.py # 106
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/orthotriang.py #
 25 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/powersum.py # 17
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/schur.py # 13
 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/sf/sfa.py # 291
 doctests failed
         sage -t  -force_lib
 devel/sage/sage/combinat/species/composition_species.py # 4 doctests
 failed
         sage -t  -force_lib
 devel/sage/sage/combinat/species/functorial_composition_species.py # 3
 doctests failed
         sage -t  -force_lib
 devel/sage/sage/combinat/species/generating_series.py # 38 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/species/library.py #
 4 doctests failed
         sage -t  -force_lib devel/sage/sage/combinat/species/species.py #
 4 doctests failed
 }}}
 but no segfault. Does one need #5457?

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12876#comment:93>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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