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1IntroductionThenotationandtelliluologyusedwillmainlyconformtothatof[5].Werecall11ereafewfundamentalnotions.Inthispaper,groupmeansabeliangroup,qdenotestheadditivegroupOfrationals,ZdenotesthegroupOfintegers.Atypeisanequivalenceclassofheightsequences.IfSisafinitesetoftypestheniuf(S)andsup(S)aretypes,whereinf(S)andsup(S)aregivenbycomponentndninlumsandmaximumsofheightsequencesrepresentingtypesinS.Twotorsionfi'eegroupsAandBarequasi-isolllorphicifthereisfEHorn(A,B)suchthatIisamonomorphismand… 相似文献
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