wcdeq - Intuitionistic Logic Explorer

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Syntax Definition wcdeq 2747

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.

**Hypotheses**
Ref	Expression
wph	wff 𝜑
vx	setvar 𝑥
vy	setvar 𝑦

**Assertion**
Ref	Expression
wcdeq	wff CondEq(𝑥 = 𝑦 → 𝜑)

See definition df-cdeq 2748 for more information.

Colors of variables: wff set class

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