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

ETPS documentation homepage


IDISJ-LEFT : SRULE

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

ETPS documentation homepage


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