#19065: A few fixes and enhancements for chain complex morphisms
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       Reporter:  jhpalmieri         |        Owner:
           Type:  defect             |       Status:  needs_review
       Priority:  major              |    Milestone:  sage-6.9
      Component:  algebraic          |   Resolution:
  topology                           |    Merged in:
       Keywords:                     |    Reviewers:  Travis Scrimshaw
        Authors:  John Palmieri      |  Work issues:
Report Upstream:  N/A                |       Commit:
         Branch:                     |  45e2206b323ad222e818be931a9e77a4a213b14c
  u/jhpalmieri/chains                |     Stopgaps:
   Dependencies:                     |
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Comment (by jhpalmieri):

 Good idea. In fact, this led me to find another bug (in the "product"
 `self * x`, we need to check that `self._domain == x._codomain`, not
 `self._codomain == x._domain`).

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Ticket URL: <http://trac.sagemath.org/ticket/19065#comment:4>
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