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Syntax Definition wmo 2205
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 2209 for more information.

Colors of variables: wff setvar class
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