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Syntax Definition wnfc 2642
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 2644 for more information.

Colors of variables: wff setvar class
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