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Syntax Definition cio 4946
Description: Extend class notation with Russell's definition description binder (inverted iota).
Hypotheses
Ref Expression
wph wff 𝜑
vx setvar 𝑥
Assertion
Ref Expression
cio class (℩𝑥𝜑)

See definition df-iota 4948 for more information.

Colors of variables: wff set class
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