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Syntax Definition cio 5156
Description: Extend class notation with Russell's definition description binder (inverted iota).
Hypotheses
Ref Expression
wph  wff  ph
vx  setvar  x
Assertion
Ref Expression
cio  class  ( iota
x ph )

See definition df-iota 5158 for more information.

Colors of variables: wff set class
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