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Syntax Definition wex 1469
Description: Extend wff definition to include the existential quantifier ("there exists").
Ref Expression
wph wff 𝜑
vx setvar 𝑥
Ref Expression
wex wff 𝑥𝜑

This syntax is primitive. The first axiom using it is ax-ie1 1470.

Colors of variables: wff set class
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