#18003: Implement Fully Packed Loop class
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       Reporter:  kdilks             |        Owner:
           Type:  enhancement        |       Status:  needs_review
       Priority:  major              |    Milestone:  sage-6.6
      Component:  combinatorics      |   Resolution:
       Keywords:  fpl, ncp, days64,  |    Merged in:
  asm, lp, fully packed loop         |    Reviewers:  Jessica Striker,
        Authors:  James Campbell,    |  Travis Scrimshaw
  Vince Knight, Jessica Striker,     |  Work issues:
  Kevin Dilks, Emily Gunawan         |       Commit:
Report Upstream:  N/A                |  0cbd4f6d2306e42b2e801c05ca81f2699df35a2d
         Branch:                     |     Stopgaps:
  public/ticket/18003                |
   Dependencies:                     |
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Comment (by kdilks):

 * I think we were putting off adding toggles and further functionality
 until we had things settled with defining the FPL class and extracting a
 link pattern. But it might not be too hard to add right now.
  * Right now we're just assuming square ice boundary conditions, which
 forces n by n. At some point we'd like to have arbitrary boundary
 conditions (which would allow n by m, and would probably require some
 modification of previous code that implicitly assumes square shape). But
 again, conscious decision to try and limit how much we're taking on.
  * Couldn't we just inherit whatever iterator SixVertexModel or
 AlternatingSignMatrices uses?
  * I'm fine with vertices being '+' .
  * I've been meaning to remove those commented lines, and make some other
 small edits to the documentation.

--
Ticket URL: <http://trac.sagemath.org/ticket/18003#comment:17>
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