Flat ring epimorphisms and universal localizations of commutative rings
Flat ring epimorphisms and universal localizations of commutative rings
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平环外同态和交换环的普遍局域化
DOI:
10.1093/qmath/haaa041
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Angeleri Hügel L
中科院分区:
文献类型:
--
作者:
Angeleri Hügel L
We study different types of localizations of a commutative noetherian ring. More precisely, we provide criteria to decide:(a) if a given flat ring epimorphism is a universal localization in the sense of Cohn and Schofield; and (b) when such universal localizations are classical rings of fractions. In order to find such criteria, we use the theory of support and we analyse the specialization closed subset associated to a flat ring epimorphism. In case the underlying ring is locally factorial or of Krull dimension one, we show that all flat ring epimorphisms are universal localizations. Moreover, it turns out that an answer to the question of when universal localizations are classical depends on the structure of the Picard group. We furthermore discuss the case of normal rings, for which the divisor class group plays an essential role to decide if a given flat ring epimorphism is a universal localization. Finally, we explore several (counter) examples which highlight the necessity of our assumptions.
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影响因子:
1.7
作者:
S. Bazzoni;J. Šťovíček
通讯作者:
J. Šťovíček
DOI:
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发表时间:
1958
期刊:
影响因子:
--
作者:
M. Nagata
通讯作者:
M. Nagata
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
C. Huneke
通讯作者:
C. Huneke
DOI:
10.1007/0-387-22081-x_7
发表时间:
2020-05
期刊:
An Introduction to Probabilistic Number Theory
影响因子:
--
作者:
Don Redmond
通讯作者:
Don Redmond
影响因子:
--
作者:
A. Neeman;M. Bökstedt
通讯作者:
A. Neeman;M. Bökstedt