CONTR : (term -> thm -> thm)

SYNOPSIS
Implements the intuitionistic contradiction rule.

DESCRIBE
When applied to a term t and a theorem A |- F, the inference rule CONTR returns the theorem A |- t.
    A |- F
   --------  CONTR "t"
    A |- t

FAILURE
Fails unless the term has type bool and the theorem has F as its conclusion.

SEEALSO  CCONTR,   CONTRAPOS,   CONTR_TAC,   NOT_ELIM

HOL  Kananaskis 0