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Syntax Definition wsbc 2737
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 φ."
Hypotheses
Ref Expression
wph wff φ
vx setvar x
cA class A
Assertion
Ref Expression
wsbc wff [A / x]φ

See definition df-sbc 2738 for more information.

Colors of variables: wff set class
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