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Syntax Definition cun 3150
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  u.  B )

See definition df-un 3157 for more information.

Colors of variables: wff set class
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