copk - New Foundations Explorer

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Syntax Definition copk 4058

Description: Extend class notation to include Kuratowski ordered pair.

**Hypotheses**
Ref	Expression
cA	class A
cB	class B

**Assertion**
Ref	Expression
copk	class ⟪A, B⟫

See definition df-opk 4059 for more information.

Colors of variables: wff setvar class