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Syntax Definition csb 3136
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 / x]B

See definition df-csb 3137 for more information.

Colors of variables: wff setvar class
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