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Syntax Definition wnfc 2212
Description: Extend wff definition to include the not-free predicate for classes.
Hypotheses
Ref Expression
vx setvar 𝑥
cA class 𝐴
Assertion
Ref Expression
wnfc wff 𝑥𝐴

See definition df-nfc 2214 for more information.

Colors of variables: wff set class
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