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Mirrors > Home > ILE Home > Th. List > wcdeq | GIF version |
Description: Extend wff notation to include conditional equality. This is a technical device used in the proof that Ⅎ is the not-free predicate, and that definitions are conservative as a result. |
Ref | Expression |
---|---|
wph | wff 𝜑 |
vx | setvar 𝑥 |
vy | setvar 𝑦 |
Ref | Expression |
---|---|
wcdeq | wff CondEq(𝑥 = 𝑦 → 𝜑) |
Colors of variables: wff set class |
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