IDISJ-LEFT : IRULEDEF

IDISJ-LEFT is an intermediate rule definition.
(P1) H !A(O)
*(P2) H !A(O) OR B(O) Idisj-L: P1
Transformation: (P2 ss) ==> (P1 ss)

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IDISJ-LEFT : MEXPR

IDISJ-LEFT is a top-level command.
Introduce a disjunction (left version).
The command format for IDISJ-LEFT is:

 <n>IDISJ-LEFT   P2   P1    B    A     P2-HYPS    P1-HYPS 
"LINE" "LINE" "GWFF" "GWFF" "LINELIST" "LINELIST"


The arguments have the following meaning:
P2 : Line containing disjunction
P1 : Line without disjunction
B : Wff to right of disjunction
A :
P2-HYPS : Hypotheses
P1-HYPS : Hypotheses

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IDISJ-LEFT : SRULE

IDISJ-LEFT is an inference rule.
Its priority is NIL

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