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Mirrors > Home > NFE Home > Th. List > cif  GIF version 
Description: Extend class notation to include the conditional operator. See dfif 3663 for a description. (In older databases this was denoted "ded".) 
Ref  Expression 

wph  wff φ 
cA  class A 
cB  class B 
Ref  Expression 

cif  class if(φ, A, B) 
Colors of variables: wff set class 
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