EQUIV-EQ is an intermediate rule definition.
*(D1) H !A(O)
(D2) H !B(O) Equiv-eq: D1
Restrictions: (WFFEQ-DEFEQ A(O) B(O))
Transformation: (pp D1 ss) ==> (pp D2 ss)

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EQUIV-EQ is a top-level command.
Rule to infer a line from one which is equal up to
definitions, lambda conversion, alphabetic change of bound variables
and the Leibniz definition of the symbol = . You may use the editor
command EXPAND= to create the desired line from the existing one.
The command format for EQUIV-EQ is:

 <n>EQUIV-EQ   D1   D2    B    A     D1-HYPS    D2-HYPS 

The arguments have the following meaning:
D1 : Lower Line
D2 : Higher Line
B : Wff on Higher Line
A : Wff on Lower Line
D1-HYPS : Hypotheses
D2-HYPS : Hypotheses

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EQUIV-EQ is an inference rule.
Its priority is NIL

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