Syntax Definition copab 4623

Description: Extend class notation to include ordered-pair class abstraction (class builder).

Hypotheses

Ref	Expression
wph	wff φ
vx	setvar x
vy	setvar y

Assertion

Ref	Expression
copab	class {⟨x, y⟩ ∣ φ}

See definition df-opab 4624 for more information.