It was invented by K. Hensel (1861-1941) in the early 20th century as an extension of numbers, and the idea is widely used in algebra and number theory. Let's define one prime number and denote it by p . A number that can be formally expressed in the form of a finite or infinite series for p is called a p -adic number. In particular , a number whose coefficients of all negative powers are 0 is called a p -adic integer. For two p - adic integers α = a0 + a1p + ... + anpn + ..., β = b0 + b1p + ... + bnpn + ... and a natural number m , if m ' ≥ m , then the coefficients up to pm in the p- adic expansion of the sum do not depend on the choice of m '. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
20世紀初頭,ヘンゼルK.Hensel(1861‐1941)によって数の一つの拡張として考案され,その考えは,代数学,整数論において広く用いられている。一つ素数を定め,それをpで表す。pに対し形式的に,という有限または無限級数の形で表されるものをp進数という。とくに,負べきの項の係数がすべて0のものをp進整数という。二つのp進整数α=a0+a1p+……+anpn+……,β=b0+b1p+……+bnpn+……と自然数mに対し,m′≧mならば,の和のp進展開のpmまでの係数は,m′の取り方によらない。
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