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Syntax Definition wmo 2118
Description: Extend wff definition to include uniqueness ("there exists at most one  x such that  ph").
Hypotheses
Ref Expression
wph  wff  ph
vx  set  x
Assertion
Ref Expression
wmo  wff  E* x ph

See definition df-mo 2122 for more information.

Colors of variables: wff set class
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