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Syntax Definition wsbc 2909
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."
Ref Expression
wph wff 𝜑
vx setvar 𝑥
cA class 𝐴
Ref Expression
wsbc wff [𝐴 / 𝑥]𝜑

See definition df-sbc 2910 for more information.

Colors of variables: wff set class
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