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Syntax Definition wsbc 2921
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 set variable  x in wff  ph."
Hypotheses
Ref Expression
wph  wff  ph
vx  set  x
cA  class  A
Assertion
Ref Expression
wsbc  wff  [. A  /  x ]. ph

See definition df-sbc 2922 for more information.

Colors of variables: wff set class
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