:: deftheorem Def20 defines CnCPC INTPRO_1:def 20 :
for X, b₂ being Subset of MC-wff holds
( b₂ = CnCPC X iff for r being Element of MC-wff holds
( r in b₂ iff for T being Subset of MC-wff st T is CPC_theory & X c= T holds
r in T ) );