We study certain properties of Noetherian rings with weak normality and seminormality in mixed characteristic. It is known that the two concepts can differ in the equal prime characteristic case, while they coincide by definition in the equal characteristic zero case. We exhibit some examples in the mixed characteristic case. We also establish the local Bertini theorem for weak normality in mixed characteristic under a certain condition.
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E China Normal Univ, Sch Finance & Stat, Shanghai 200241, Peoples R ChinaE China Normal Univ, Sch Finance & Stat, Shanghai 200241, Peoples R China
Wu Ping
Zhu LiXing
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Yunnan Univ Finance & Econ, Sch Stat & Math, Kunming 650221, Yunnan, Peoples R China
Hong Kong Baptist Univ, Dept Math, Hong Kong 999077, Hong Kong, Peoples R ChinaE China Normal Univ, Sch Finance & Stat, Shanghai 200241, Peoples R China
Zhu LiXing
Fang Yun
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Shanghai Normal Univ, Math & Sci Coll, Shanghai 200234, Peoples R ChinaE China Normal Univ, Sch Finance & Stat, Shanghai 200241, Peoples R China
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Univ Napoli Federico II, Dipartimento Matemat & Applicaz, Via Cintia, I-80126 Naples, ItalyUniv Napoli Federico II, Dipartimento Matemat & Applicaz, Via Cintia, I-80126 Naples, Italy
de Giovanni, Francesco
Trombetti, Marco
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Univ Napoli Federico II, Dipartimento Matemat & Applicaz, Via Cintia, I-80126 Naples, ItalyUniv Napoli Federico II, Dipartimento Matemat & Applicaz, Via Cintia, I-80126 Naples, Italy