File: is_imp.doc

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\DOC is_imp

\TYPE {is_imp : term -> bool}

\SYNOPSIS
Tests if a term is an application of implication.

\DESCRIBE
The call {is_imp t} returns {true} if {t} is of the form {p ==> q} for some {p} 
and {q}, and returns {false} otherwise.

\FAILURE
Never fails.

\SEEALSO
dest_imp.

\ENDDOC