File: is_imp.doc

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\DOC is_imp

\TYPE {is_imp : (term -> bool)}

\SYNOPSIS
Tests a term to see if it is an implication.

\DESCRIBE
{is_imp "t1 ==> t2"} returns {true}. 
If the term is not an implication the result is {false}.

\FAILURE
Never fails.

\COMMENTS
This function used to take negation as an implication with {F} conclusion.
This behaviour is implemented by the function {is_neg_imp}.

\SEEALSO
mk_imp, dest_imp, dest_neg_imp, is_neg_imp.

\ENDDOC