wsbc - Metamath Proof Explorer

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Syntax Definition wsbc 3788

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 3789 for more information.

Colors of variables: wff setvar class

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