PUSHNEG : MEXPR

PUSHNEG is a top-level command.
Push in negation.
The command format for PUSHNEG is:

 <n>PUSHNEG   D1   D2    A PUSH-NEGATION   D1-HYPS    D2-HYPS 
"LINE" "LINE" "GWFF" "GWFF" "LINELIST" "LINELIST"


The arguments have the following meaning:
D1 : Line with Negation
D2 : Line after Pushing in Negation one Step
A : Scope of Negation
PUSH-NEGATION : Wff after Pushing in Negation
D1-HYPS : Hypotheses
D2-HYPS : Hypotheses

ETPS documentation homepage


PUSHNEG : SRULE

PUSHNEG is an inference rule.
Its priority is 1

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