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Syntax Definition cun 2972
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 (𝐴𝐵)

See definition df-un 2978 for more information.

Colors of variables: wff set class
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