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Syntax Definition wnf 1390
Description: Extend wff definition to include the not-free predicate.
Hypotheses
Ref Expression
wph wff 𝜑
vx setvar 𝑥
Assertion
Ref Expression
wnf wff 𝑥𝜑

See definition df-nf 1391 for more information.

Colors of variables: wff set class
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