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Syntax Definition wmo 2459
Description: Extend wff definition to include uniqueness ("there exists at most one 𝑥 such that 𝜑").
Ref Expression
wph wff 𝜑
vx setvar 𝑥
Ref Expression
wmo wff ∃*𝑥𝜑

See definition df-mo 2463 for more information.

Colors of variables: wff setvar class
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