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Syntax Definition wmo 1901
Description: Extend wff definition to include uniqueness ("there exists at most one 𝑥 such that 𝜑").
Hypotheses
Ref Expression
wph wff 𝜑
vx setvar 𝑥
Assertion
Ref Expression
wmo wff ∃*𝑥𝜑

See definition df-mo 1904 for more information.

Colors of variables: wff set class
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