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Syntax Definition wreu 2751
Description: Extend wff notation to include restricted existential uniqueness.
Ref Expression
wph  wff  ph
vx  setvar  x
cA  class  A
Ref Expression
wreu  wff  E! x  e.  A  ph

See definition df-reu 2756 for more information.

Colors of variables: wff setvar class
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