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The universal deformation of the Witt ring scheme
Christopher Deningera, Young-Tak Ohb a Mathematisches Institut, Westfälische Wilhelms-Universität Münster, Germany
b Department of Mathematics, Sogang University, Seoul, Republic of Korea (South)
Abstract:
We determine the universal deformation over reduced base rings of the Witt ring scheme enhanced by a Frobenius lift and Verschiebung. It agrees with a $q$-deformation introduced earlier by the second author; we also give a simpler description for this. In the appendix we discuss a Witt vector theory for ind-rings which may be of independent interest.
Bibliography: 7 titles.
Keywords:
Witt ring, $q$-deformation.
Received: 06.05.2016 and 31.08.2016
Citation:
Christopher Deninger, Young-Tak Oh, “The universal deformation of the Witt ring scheme”, Sb. Math., 208:6 (2017), 764–790
Linking options:
https://www.mathnet.ru/eng/sm8730https://doi.org/10.1070/SM8730 https://www.mathnet.ru/eng/sm/v208/i6/p26
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Abstract page: | 411 | Russian version PDF: | 40 | English version PDF: | 26 | References: | 49 | First page: | 21 |
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