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Syntax Definition wnfc 2571
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  F/_ x A

See definition df-nfc 2573 for more information.

Colors of variables: wff setvar class
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