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Syntax Definition cun 3916
Description: Extend class notation to include union of two classes (read: "𝐴 union 𝐵").
Ref Expression
cA class 𝐴
cB class 𝐵
Ref Expression
cun class (𝐴𝐵)

See definition df-un 3923 for more information.

Colors of variables: wff setvar class
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