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Syntax Definition csb 3009
Description: Extend class notation to include the proper substitution of a class for a set into another class.
Hypotheses
Ref Expression
vx  set  x
cA  class  A
cB  class  B
Assertion
Ref Expression
csb  class  [_ A  /  x ]_ B

See definition df-csb 3010 for more information.

Colors of variables: wff set class
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