wnfOLD - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > wnfOLD		Structured version Visualization version Unicode version

Syntax Definition wnfOLD 1709

Description: Extend wff definition to include the old not-free predicate. Obsolete as of 16-Sep-2021. (New usage is discouraged.)

**Hypotheses**
Ref	Expression
wph
vx

**Assertion**
Ref	Expression
wnfOLD

See definition df-nfOLD 1721 for more information.

Colors of variables: wff setvar class