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Syntax Definition weu 1897
Description: Extend wff definition to include existential uniqueness ("there exists a unique x such that φ").
Hypotheses
Ref Expression
wph wff φ
vx setvar x
Assertion
Ref Expression
weu wff ∃!xφ

See definition df-eu 1900 for more information.

Colors of variables: wff set class
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