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Syntax Definition wex 1397
Description: Extend wff definition to include the existential quantifier ("there exists").
Hypotheses
Ref Expression
wph  wff  ph
vx  setvar  x
Assertion
Ref Expression
wex  wff  E. x ph

This syntax is primitive. The first axiom using it is ax-ie1 1398.

Colors of variables: wff set class
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