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Syntax Definition csb 2909
Description: Extend class notation to include the proper substitution of a class for a set into another class.
Hypotheses
Ref Expression
vx setvar 𝑥
cA class 𝐴
cB class 𝐵
Assertion
Ref Expression
csb class 𝐴 / 𝑥𝐵

See definition df-csb 2910 for more information.

Colors of variables: wff set class
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