#20499: Graphs: docstring of _add_ conflicts with function
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       Reporter:  jmantysalo    |        Owner:
           Type:  defect        |       Status:  needs_info
       Priority:  major         |    Milestone:  sage-7.2
      Component:  graph theory  |   Resolution:
       Keywords:                |    Merged in:
        Authors:                |    Reviewers:
Report Upstream:  N/A           |  Work issues:
         Branch:                |       Commit:
   Dependencies:                |     Stopgaps:
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Changes (by jmantysalo):

 * status:  new => needs_info
 * cc: dcoudert (added)


Comment:

 David, a question. How should this function work?

 - Not at all, remove this.
 - As now, i.e. always relabel to integers.
 - Keep vertices, raise exception if there is a common vertex.
 - Keep vertices, do like `union()` does.
 - Keep vertices, but relabel common ones (like the docstring now says).

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Ticket URL: <http://trac.sagemath.org/ticket/20499#comment:1>
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