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Mirrors > Home > MPE Home > Th. List > wnfOLD | Structured version Visualization version GIF version |
Description: Extend wff definition to include the not-free predicate. (New usage is discouraged.) |
Ref | Expression |
---|---|
wph | wff 𝜑 |
vx | setvar 𝑥 |
Ref | Expression |
---|---|
wnfOLD | wff Ⅎ𝑥𝜑 |
Colors of variables: wff setvar class |
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