IMP_ELIM : (thm -> thm)

SYNOPSIS
Transforms |- s ==> t into |- ~s \/ t.

DESCRIBE
When applied to a theorem A |- s ==> t, the inference rule IMP_ELIM returns the theorem A |- ~s \/ t.
    A |- s ==> t
   --------------  IMP_ELIM
    A |- ~s \/ t

FAILURE
Fails unless the theorem is implicative.

SEEALSO  NOT_INTRO,   NOT_ELIM

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