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Syntax Definition wsbc 3170
Description: Extend wff notation to include the proper substitution of a class for a set. Read this notation as "the proper substitution of class for set variable in wff ."
Hypotheses
Ref Expression
wph
vx
cA
Assertion
Ref Expression
wsbc

See definition df-sbc 3171 for more information.

Colors of variables: wff set class
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