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Syntax Definition cab 2269
Description: Introduce the class builder or class abstraction notation ("the class of sets  x such that  ph is true"). Our class variables  A,  B, etc. range over class builders (implicitly in the case of defined class terms such as df-nul 3456). Note that a set variable can be expressed as a class builder per theorem cvjust 2278, justifying the assignment of set variables to class variables via the use of cv 1622.
Hypotheses
Ref Expression
wph  wff  ph
vx  set  x
Assertion
Ref Expression
cab  class  { x  |  ph }

See definition df-clab 2270 for more information.

Colors of variables: wff set class
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