Microlocalizations of Modules with Regular Singularities over Filtered Rings
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摘要: 滤环R上的模在微局部化下的性质是许多文献讨论的问题.Essen证明了Zariski滤环R上的模M若具有正则奇点,则它的微局部化Q\+μ\-S(M)作为Q\+μ\-S(R) 模仍具有正则奇点,但Q\+μ\-S(M)作为R 模是否仍具有正则奇点则不知道.对这一问题进行了讨论,并证明了若M是有正则奇点的R 模且M上的局部滤是良滤,则Q\+μ\-S(M)作为R 模是具正则奇点的模.在一定条件下解决了该问题.Abstract: The microlocalized properties of a module over a filtered ring R are discussed by many papers in recent years.For example,Essen proved that if M is a module with regular singularities over a Zariski ring R,then its microlocalization Q\+μ\-S(M) is a Q\+μ\-S(R) module with regular singularities.But it is unknown that if Q\+μ\-S(M) is a R module with regular singularities.In this paper the regular singularities of the microlocalization Q\+μ\-S(M) are discussed as an R module while R is a Zariski filtered ring and M is an R module with regular singularities.An answer to the problem in suitable conditions is given.The result is proved that if M is a R module with regular singularities and the localized filtation on M is a good R filtration then the microlocalization Q\+μ\-S(M) of M is a R module with regular singularities.
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Key words:
- filtration /
- ring /
- module /
- regular singularities /
- microlocalization /
- localized filtration
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1. Essen A V D.Modules with regular singularities over filtered rings and algebraic microlocalization.Lecture Notes in Mathematics 1296,New York:Springer Verlag,1987.384~398 2. Essen A V D.Modules with regular singularities over filtered rings.Publ RIMS Kyoto Univ,1986,22:849~887 3. Nastasescu C,Van Oystaeyen F.Graded ring theory (Math Lib 28).Amsterdam:North Holland,1982 4. Nastasescu C,Van Oystaeyen F.Topics in the theory of graded and filtered rings and modules.Lecture Notes in Mathematics 758,New York:Springer Verlag,1978.259~271 5. Bjork J E.Rings of differential operators (Math Lib 21).Amsterdam:North Holland,1979 6. Bjork J E.The Auslader condition on Noetherian rings.Lecture Notes in Mathematics 1404,New York:Springer Verlag,1989.137~173 7. Asensio M J,Van Bergh M,Van Oystaeyen F.A new algebraic approach to microlocalization of filtered rings.Trans A M S,1989,316(2):537~553
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