REPLACE-EQUIV is a wff operation.
Replace one occurrence of a symbol (such as AND) by a predefined
equivalent wff (such as [lambda p lambda q.~.p IMPLIES ~q]). In this
example repsym is AND and rep-by is IMPLIES. To see if a symbol can be
replaced by this command, enter HELP symbol; any such replacements will be
listed under the heading 'Replaceable Symbols'.
The calling scheme for REPLACE-EQUIV is:


The result is of type GWFF.

The arguments have the following meaning:
REP-SYM : Symbol to be Replaced
REP-BY : Replace by (Name)
REP-IN : Replace in

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