The scheme of monogenic generators II: local monogenicity and twists
The scheme of monogenic generators II: local monogenicity and twists
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单基因生成器方案 II:局部单基因性和扭曲
DOI:
10.1007/s40993-023-00449-7
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发表时间:
2023
影响因子:
0.8
通讯作者:
Smith, Hanson
中科院分区:
文献类型:
--
作者:
Arpin, Sarah;Bozlee, Sebastian;Herr, Leo;Smith, Hanson
This is the second paper in a series of two studying monogenicity of number rings from a moduli-theoretic perspective. By the results of the first paper in this series, a choice of a generatorfor anA-algebraBis a point of the scheme. In this paper, we study and relate several notions of local monogenicity that emerge from this perspective. We first consider the conditions under which the extensionB/Aadmits monogenerators locally in the Zariski and finer topologies, recovering a theorem of Pleasants as a special case. We next consider the case in whichB/Ais étale, where the local structure of étale maps allows us to construct a universal monogenicity space and relate it to an unordered configuration space. Finally, we consider whenB/Aadmits local monogenerators that differ only by the action of some group (usuallyor), giving rise to a notion of twisted monogenerators. In particular, we show a number ringAhas class number one if and only if each twisted monogenerator is in fact a global monogenerator.
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DOI:
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发表时间:
1969
期刊:
影响因子:
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作者:
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--
发表时间:
2003
期刊:
影响因子:
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作者:
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