ETA* : IRULEDEF

ETA* is an intermediate rule definition.
*(D1) H !A(O)
(D2) H !B(O) Eta Rule: D1
Restrictions: (WFFEQ-AB-ETA A(O) B(O))
Transformation: (pp D1 ss) ==> (pp D2 ss)

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ETA* : MEXPR

ETA* is a top-level command.
Rule to infer a line from one which is equal up to lambda conversion
using eta rule (but NOT beta rule) and alphabetic change of bound variables.
The command format for ETA* is:

 <n>ETA*   D1   D2    B    A     D1-HYPS    D2-HYPS 
"LINE" "LINE" "GWFF" "GWFF" "LINELIST" "LINELIST"


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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ETA* : SRULE

ETA* is an inference rule.
Its priority is NIL

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