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Syntax Definition wreu 1650
Description: Extend wff notation to include restricted existential uniqueness.
Hypotheses
Ref Expression
wph wff φ
vx set x
cA class A
Assertion
Ref Expression
wreu wff ∃!x ∈ A φ
See definition df-reu 1654 for more information.
Colors of variables: wff set class
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