caiota - Mathbox for Alexander van der Vekens

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Syntax Definition caiota 44462

Description: Extend class notation with an alternative for Russell's definition of a description binder (inverted iota).

**Hypotheses**
Ref	Expression
wph	wff 𝜑
vx	setvar 𝑥

**Assertion**
Ref	Expression
caiota	class (℩'𝑥𝜑)

See definition df-aiota 44464 for more information.

Colors of variables: wff setvar class