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Syntax Definition cab 2596
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 (implicitly in the case of defined class terms such as df-nul 3875). Note that a setvar variable can be expressed as a class builder per theorem cvjust 2605, justifying the assignment of setvar variables to class variables via the use of cv 1474.
Ref Expression
wph wff 𝜑
vx setvar 𝑥
Ref Expression
cab class {𝑥𝜑}

See definition df-clab 2597 for more information.

Colors of variables: wff setvar class
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