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Mirrors > Home > ILE Home > Th. List > cab  Structured version GIF version 
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 2013, justifying the assignment of setvar variables to class variables via the use of cv 1225. 
Ref  Expression 

wph  wff φ 
vx  setvar x 
Ref  Expression 

cab  class {x ∣ φ} 
Colors of variables: wff set class 
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