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Syntax Definition wich 44601
Description: Extend wff notation to include the propery of a wff 𝜑 that the setvar variables 𝑥 and 𝑦 are interchangeable. Read this notation as "𝑥 and 𝑦 are interchangeable in wff 𝜑".
Hypotheses
Ref Expression
wph wff 𝜑
vx setvar 𝑥
vy setvar 𝑦
Assertion
Ref Expression
wich wff [𝑥𝑦]𝜑

See definition df-ich 44602 for more information.

Colors of variables: wff setvar class
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