#21081: Cup product for cochains
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       Reporter:  vbraun              |        Owner:
           Type:  enhancement         |       Status:  new
       Priority:  major               |    Milestone:  sage-7.3
      Component:  algebraic topology  |   Resolution:
       Keywords:                      |    Merged in:
        Authors:                      |    Reviewers:
Report Upstream:  N/A                 |  Work issues:
         Branch:                      |       Commit:
   Dependencies:                      |     Stopgaps:
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Comment (by vbraun):

 What about splitting `Chains` and `Cochains` into separate parents? Of
 course its somehow the same thing but notation is different and people
 will probably be confused if there are `cochain.boundary()` and
 `chain.cup_product()` methods...

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Ticket URL: <https://trac.sagemath.org/ticket/21081#comment:2>
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