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Syntax Definition cun 3933
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 3940 for more information.

Colors of variables: wff setvar class
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