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    • Andrei Paskevich's avatar
      verify termination (à la Fixpoint) of recursive logic definitions · f92739a1
      Andrei Paskevich authored
      the verification algorithm must always terminate and be reasonably
      performant in practice, but its worst-case complexity is unknown
      and probably exponential. What is quite easy when there is only
      one recursive definition, becomes difficult when there is a group
      of mutually recursive definitions. An educated discussion would
      be highly appreciated.
      
      BTW, I had to convert a couple of recursive "logic"s on integers
      into an abstract "logic" + axiom. Pretty much all of them supposed
      that the argument was non-negative, and thus were non-terminating!
      f92739a1
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    • Andrei Paskevich's avatar
      reworking tags and transformations, stage 1: · 18a0e0b0
      Andrei Paskevich authored
      - introduce a new Theory.tdecl "Meta" to be used for tags
      - simplify cloning procedure, get rid of the th_clone field
      - when a goal proposition is discarded during cloning, 
        it's still keeped in the theory as a "skip proposition",
        this is needed to preserve/clone every local identifier.
        Skip propositions are eliminated during task formation.
      - get rid of a separate Task.tdecl type
      - reorganize the Task.task_hd record:
        * use/clone history is cached in a theory-keyed map;
        * meta-properties are cached in a tagname-keyed map.
        This is done to simplify the fine-grained configuration
        of transformations.
      18a0e0b0
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