wnfc - Metamath Proof Explorer

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Syntax Definition wnfc 2886

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 Ⅎ𝑥𝐴

See definition df-nfc 2888 for more information.

Colors of variables: wff setvar class