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NonCommutative Valuation Rings and SemiHereditary Orders (KMonographs in Mathematics, 3),New
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Much progress has been made during the last decade on the subjects of non commutative valuation rings, and of semihereditary and Priifer orders in a simple Artinian ring which are considered, in a sense, as global theories of noncommu tative valuation rings. So it is worth to present a survey of the subjects in a selfcontained way, which is the purpose of this book. Historically noncommutative valuation rings of division rings were first treat ed systematically in Schilling's Book [Sc], which are nowadays called invariant valuation rings, though invariant valuation rings can be traced back to Hasse's work in [Has]. Since then, various attempts have been made to study the ideal theory of orders in finite dimensional algebras over fields and to describe the Brauer groups of fields by usage of 'valuations', 'places', 'preplaces', 'value functions' and 'pseudoplaces'. In 1984, N. 1. Dubrovin defined noncommutative valuation rings of simple Artinian rings with notion of places in the category of simple Artinian rings and obtained significant results on noncommutative valuation rings (named Dubrovin valuation rings after him) which signify that these rings may be the correct def inition of valuation rings of simple Artinian rings. Dubrovin valuation rings of central simple algebras over fields are, however, not necessarily to be integral over their centers.
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