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
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