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\TYPE {CONTR : (term -> thm -> thm)}
\SYNOPSIS
Implements the intuitionistic contradiction rule.
\KEYWORDS
rule, contradiction.
\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.
\ENDDOC
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