NOT_ELIM : (thm -> thm)

SYNOPSIS
Transforms |- ~t into |- t ==> F.

DESCRIBE
When applied to a theorem A |- ~t, the inference rule NOT_ELIM returns the theorem A |- t ==> F.
      A |- ~t
   --------------  NOT_ELIM
    A |- t ==> F

FAILURE
Fails unless the theorem has a negated conclusion.

SEEALSO  IMP_ELIM,   NOT_INTRO

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