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Syntax Definition weu 2114
Description: Extend wff definition to include existential uniqueness ("there exists a unique  x such that  ph").
Hypotheses
Ref Expression
wph  wff  ph
vx  set  x
Assertion
Ref Expression
weu  wff  E! x ph

See definition df-eu 2118 for more information.

Colors of variables: wff set class
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