THE STRUCTURE THEORY OF COMPLETE LOCAL RINGS
THE STRUCTURE THEORY OF COMPLETE LOCAL RINGS
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完全局部环的结构理论
DOI:
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发表时间:
2019
期刊:
影响因子:
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通讯作者:
Zhan Jiang
中科院分区:
文献类型:
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作者:
Zhan Jiang
1.1. Local rings. A local ring R contains a field iff char(R) = char(K): • If char(K) = 0, then it’s clearly that R does. Therefore R contains a copy of Z. Every integer has a nonzero image in R/m, therefore they are units in R, then Q injects into R. If R contains a field of characteristic 0, then every prime integer is invertible, therefore char(K) = 0. • If char(K) = p, char(R) = p. Then R contains Z/pZ. If R contains a copy of Z/pZ, then char(K) = p. So we have following definition Definition 1.1. A local ring (R,m, K) is equicharacteristic if R contains a field. A local ring (R,m, K) is mixed characteristic if it’s not equicharacteristic.