WFF-DOUBLE-NEGATION* : WFFOP

WFF-DOUBLE-NEGATION* is a wff operation.
Recursively remove double negations:
not not A --> A.
 
The calling scheme for WFF-DOUBLE-NEGATION* is:

(WFF-DOUBLE-NEGATION* GWFF)
"GWFF"


The result is of type GWFF.

The arguments have the following meaning:
GWFF : Wff

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