#13119: ._apply_module_morphism() in combinat/free_module.py doesn't handle zero
element properly
-----------------------------+----------------------------------------------
   Reporter:  zabrocki       |             Owner:  sage-combinat
       Type:  defect         |            Status:  new          
   Priority:  minor          |         Milestone:  sage-5.1     
  Component:  combinatorics  |          Keywords:               
Work issues:                 |   Report Upstream:  N/A          
  Reviewers:                 |           Authors:  Mike Zabrocki
  Merged in:                 |      Dependencies:               
   Stopgaps:                 |  
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 a potential defect in ._apply_module_morphism function calls list(
 self.basis().keys() ) when self.is_zero() is True.  This works fine if
 self.basis() is a finite set, but causes a problem if self.basis() is an
 infinite set with an iteration function.   In this case, the function
 hangs trying to list the infinite set.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13119>
Sage <http://www.sagemath.org>
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