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#18 reasonning with < and <=

closed
None
5
2009-09-04
2009-08-03
Anonymous
No

given the set of rewrite rules in ,http://wiki.event-b.org/index.php/Set_Rewrite_Rules,
if does not seem possible to infer a <= b - 1 from a < b ?

Discussion

  • Carine Pascal

    Carine Pascal - 2009-08-20
    • assigned_to: nobody --> lvoisin
     
  • Carine Pascal

    Carine Pascal - 2009-08-20
    • assigned_to: lvoisin --> nicolas_beauger
     
  • Nicolas Beauger

    Nicolas Beauger - 2009-08-20

    Indeed rewrite rules do not allow to infer a <= b - 1 from a < b.
    Everything that has to do with arithmetic is managed by external prover ML.
    So, if you have ML installed and it's selected in auto-tactics, a <= b - 1 will be proved from a < b.

     
  • Nicolas Beauger

    Nicolas Beauger - 2009-08-20
    • status: open --> pending
     
  • SourceForge Robot

    This Tracker item was closed automatically by the system. It was
    previously set to a Pending status, and the original submitter
    did not respond within 14 days (the time period specified by
    the administrator of this Tracker).

     
  • SourceForge Robot

    • status: pending --> closed
     

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