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Syntax Definition wssb 32988
Description: Syntax for the substitution of a variable for a variable in a formula. (Contributed by BJ, 22-Dec-2020.)
Ref Expression
wph wff 𝜑
vx setvar 𝑥
vt setvar 𝑡
Ref Expression
wssb wff [𝑡/𝑥]b𝜑

See definition df-ssb 32989 for more information.

Colors of variables: wff setvar class
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