Syntax Definition copab 2681

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

Hypotheses

Ref	Expression
wph	wff φ
vx	set x
vy	set y

Assertion

Ref	Expression
copab	class {⟨x, y⟩∣φ}

See definition df-opab 2682 for more information.

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