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Ring of p-adic periods : ウィキペディア英語版
Ring of p-adic periods

In mathematics, Fontaine's period rings are a collection of commutative rings first defined by Jean-Marc Fontaine that are used to classify ''p''-adic Galois representations.
==The ring BdR==
The ring \mathbf_ is defined as follows. Let \mathbf_p denote the completion of \overline. Let
:\tilde \mathcal_/(p)
So an element of \tilde_/(p) such that x_^p \equiv x_i \pmod p. There is a natural projection map f:\tilde_/(p) given by f(x_1,x_2,\dotsc) = x_1. There is also a multiplicative (but not additive) map t:\tilde_ defined by t(x_,x_2,\dotsc) = \lim_ \tilde x_i^, where the \tilde x_i are arbitrary lifts of the x_i to \mathcal_. The composite of t with the projection \mathcal_\to \mathcal_/(p) is just f. The general theory of Witt vectors yields a unique ring homomorphism \theta:W(\tilde_ such that \theta(()) = t(x) for all x\in \tilde_^+ is defined to be completion of \tilde}^+)() with respect to the ideal \ker\left( \theta : \tilde_p \right). The field \mathbf_ is just the field of fractions of \mathbf_^+.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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