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      • Theory-functions

      Theory

      Retrieve named theory

      Examples:

      For use in in-theory events or :in-theory hints:
      (theory 'ground-zero)

      For direct evaluation at the top-level loop:
      (let ((world (w state))) (theory 'ground-zero))

      In the examples above, the theory returned is the one in force when ACL2 is started up (see ground-zero).

      General Form:
      (theory name)

      where name is the name of a previously executed deftheory event (otherwise a hard error occurs). Returns the named theory. See theories.

      This ``function'' is actually a macro that expands to a term mentioning the single free variable world. When theory expressions are evaluated by in-theory or the :in-theory hint, world is bound to the current ACL2 world.