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Syntax Definition wsbc 3278
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."
Ref Expression
wph  wff  ph
vx  setvar  x
cA  class  A
Ref Expression
wsbc  wff  [. A  /  x ]. ph

See definition df-sbc 3279 for more information.

Colors of variables: wff setvar class
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