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Syntax Definition weu 1900
Description: Extend wff definition to include existential uniqueness ("there exists a unique 𝑥 such that 𝜑").
Ref Expression
wph wff 𝜑
vx setvar 𝑥
Ref Expression
weu wff ∃!𝑥𝜑

See definition df-eu 1903 for more information.

Colors of variables: wff set class
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