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Syntax Definition wnfOLD 1749
Description: Extend wff definition to include the old not-free predicate. Obsolete as of 16-Sep-2021. (New usage is discouraged.)
Ref Expression
wph wff 𝜑
vx setvar 𝑥
Ref Expression
wnfOLD wff 𝑥𝜑

See definition df-nfOLD 1761 for more information.

Colors of variables: wff setvar class
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