Package deal theorems and splitting orders
in dimension 1
Lawrence S. Levy and Charles J. Odenthal
Trans. Amer. Math. Soc. 348 (1996), 3457-3503
Primary 16P40, 16P50, 16W60; Secondary 13E05, 13B30, 13J10
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Abstract: Let be a module-finite algebra over a commutative noetherian ring of Krull dimension 1. We determine when a collection of finitely generated modules over the localizations , at maximal ideals of , is the family of all localizations of a finitely generated -module . When is semilocal we also determine which finitely generated modules over the -adic completion of are completions of finitely generated -modules.
If is an -order in a semisimple artinian ring, but not contained in a maximal such order, several of the basic tools of integral representation theory behave differently than in the classical situation. The theme of this paper is to develop ways of dealing with this, as in the case of localizations and completions mentioned above. In addition, we introduce a type of order called a ``splitting order'' of that can replace maximal orders in many situations in which maximal orders do not exist.
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Lawrence S. Levy
Department of Mathematics, University of Wisconsin, Madison, Wisconsin 53706-1388
Charles J. Odenthal
Department of Mathematics, University of Toledo, Toledo, Ohio 43606-3390
Received by editor(s):
April 11, 1994
Received by editor(s) in revised form:
September 25, 1995
Levy’s research was partially supported by NSF and NSA grants.
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American Mathematical Society