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Syntax Definition csu 13508
Description: Extend class notation to include finite summations. (An underscore was added to the ASCII token in order to facilitate set.mm text searches, since "sum" is a commonly used word in comments.)
Hypotheses
Ref Expression
cA
cB
vk
Assertion
Ref Expression
csu

See definition df-sum 13509 for more information.

Colors of variables: wff setvar class
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