#11935: Make parent/element classes independent of base rings
----------------------------------------------------------+-----------------
       Reporter:  SimonKing                               |         Owner:      
                            
           Type:  enhancement                             |        Status:  
needs_review                    
       Priority:  major                                   |     Milestone:  
sage-5.10                       
      Component:  categories                              |    Resolution:      
                            
       Keywords:  parent class, element class, category   |   Work issues:      
                            
Report Upstream:  N/A                                     |     Reviewers:  
Nicolas Thiery, Travis Scrimshaw
        Authors:  Simon King                              |     Merged in:      
                            
   Dependencies:  #9138, #11900, #11943, #12875,  #12877  |      Stopgaps:      
                            
----------------------------------------------------------+-----------------

Comment (by SimonKing):

 When applying the patches, sage -br gives me
 {{{
 ----------------------------------------------------------------------
 | Sage Version 5.9.rc0, Release Date: 2013-04-25                     |
 | Type "notebook()" for the browser-based notebook interface.        |
 | Type "help()" for help.                                            |
 ----------------------------------------------------------------------
 **********************************************************************
 *                                                                    *
 * Warning: this is a prerelease version, and it may be unstable.     *
 *                                                                    *
 **********************************************************************
 /home/simon/SAGE/prerelease/sage-5.9.rc0/local/lib/python2.7/site-
 packages/sage/categories/category.py:1140: UserWarning:
 Objects.HomCategory.ParentMethods should not have a super class
   warn("%s.%s should not have a super class"%(cls.__name__,
 method_provider))

 **********************************************************************

 Oops, Sage crashed. We do our best to make it stable, but...

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 }}}

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11935#comment:85>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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