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Syntax Definition cab 2023
Description: Introduce the class builder or class abstraction notation ("the class of sets x such that φ is true"). Our class variables A, B, etc. range over class builders (sometimes implicitly). Note that a setvar variable can be expressed as a class builder per theorem cvjust 2032, justifying the assignment of setvar variables to class variables via the use of cv 1241.
Hypotheses
Ref Expression
wph wff φ
vx setvar x
Assertion
Ref Expression
cab class {xφ}

See definition df-clab 2024 for more information.

Colors of variables: wff set class
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