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单词 PadicIntegers
释义

p-adic integers


1 Basic construction

For any prime p, the p–adic integers is the ring obtained by taking the completion of the integers with respect to the metric induced by the norm

|x|:=1pνp(x),x,(1)

where νp(x) denotes the largest integer e such that pe divides x. The induced metric d(x,y):=|x-y| is called the p–adic metric on . The ring of p–adic integers is usually denoted by p, and its fraction field by p.

2 Profinite viewpoint

The ring p of p–adic integers can also be constructed by taking the inverse limitMathworldPlanetmath

p:=lim/pn

over the inverse systemMathworldPlanetmath /p2/p0 consisting of the rings /pn, for all n0, with the projection maps defined to be the unique maps such that the diagram

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更新时间:2025/5/5 0:10:52