cun - Intuitionistic Logic Explorer

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Syntax Definition cun 2888

Description: Extend class notation to include union of two classes (read: "A union B").

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

**Assertion**
Ref	Expression
cun	class (A ∪ B)

See definition df-un 2895 for more information.

Colors of variables: wff set class