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Mirrors > Home > MPE Home > Th. List > wsbc  Structured version Unicode version 
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 setvar variable in wff ." 
Ref  Expression 

wph  
vx  
cA 
Ref  Expression 

wsbc 
Colors of variables: wff setvar class 
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