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  • 简介:§1.IntroductionLet(Q,&~,P)beaseparableprobabilityspacewith&~=a(An>n>l),^beasubo-fieldof&~.SetandF*-E\.Ima.g..(2)ByFollmerLemma(o.f.[1],Th.3.5andTh.3.7),wemayassumethatwehavechosenaversionof(Ft)t><>suchthatforallw,F.(w}isarightcontinuousincreasingfunctionwithF0(w~)=0andFt(w}=1forallt^-~-.(Suchaversionof£(Ft)canalsobeconstructedbyelementarymethod.)Forafixedw,denoteby

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