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Syntax Definition csu 9872
Description: Extend class notation to include finite summations. (An underscore was added to the ASCII token in order to facilitate text searches, since "sum" is a commonly used word in comments.)
Ref Expression
cA class 𝐴
cB class 𝐵
vk setvar 𝑘
Ref Expression
csu class Σ𝑘𝐴 𝐵

See definition df-sum 9873 for more information.

Colors of variables: wff set class
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