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Syntax Definition wsbc 2955
Description: Extend wff notation to include the proper substitution of a class for a set. Read this notation as "the proper substitution of class A for setvar variable x in wff ph".
Hypotheses
Ref Expression
wph wff ph
vx setvar x
cA class A
Assertion
Ref Expression
wsbc wff [. A / x ]. ph
See definition df-sbc 2956 for more information.
Colors of variables: wff set class
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