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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 is defined as follows. Let denote the completion of . Let : So an element of such that . There is a natural projection map given by . There is also a multiplicative (but not additive) map defined by , where the are arbitrary lifts of the to . The composite of with the projection is just . The general theory of Witt vectors yields a unique ring homomorphism such that for all is defined to be completion of with respect to the ideal . The field is just the field of fractions of .
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