#9016: make morphisms hashable
-------------------------------+--------------------------------------------
   Reporter:  burcin           |          Owner:  AlexGhitza   
       Type:  enhancement      |         Status:  needs_info   
   Priority:  major            |      Milestone:  sage-4.7.1   
  Component:  categories       |       Keywords:               
Work_issues:                   |       Upstream:  N/A          
   Reviewer:  Robert Bradshaw  |         Author:  Burcin Erocal
     Merged:                   |   Dependencies:               
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Changes (by robertwb):

  * status:  needs_review => needs_info


Comment:

 Hashing the string representation is preferable, or the image of the
 generators of the codomain (caching the result if the performance isn't
 sufficient). Either that or raising an error and requiring all specific
 subclasses (that have the information to distinguish between distinct
 elements) implement this.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9016#comment:11>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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