wnfc - Intuitionistic Logic Explorer

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Syntax Definition wnfc 2143

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 2145 for more information.

Colors of variables: wff set class