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Syntax Definition wex 1453
Description: Extend wff definition to include the existential quantifier ("there exists").
Hypotheses
Ref Expression
wph wff 𝜑
vx setvar 𝑥
Assertion
Ref Expression
wex wff 𝑥𝜑

This syntax is primitive. The first axiom using it is ax-ie1 1454.

Colors of variables: wff set class
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