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Syntax Definition weu 2649
Description: Extend wff definition to include the unique existential quantifier ("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 2650 for more information.

Colors of variables: wff setvar class
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