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Syntax Definition csu 12434
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  set  k
Ref Expression
csu  class  sum_ k  e.  A  B

See definition df-sum 12435 for more information.

Colors of variables: wff set class
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