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P-adic order : ウィキペディア英語版 | P-adic order
In number theory, for a given prime number , the -adic order or -adic additive valuation of a non-zero integer is the highest exponent ν such that ν divides . The -adic valuation of is defined to be . It is commonly abbreviated ν(). If is a rational number in lowest terms, so that and are relatively prime, then ν() is equal to ν() if divides , or -ν() if divides , or to 0 if it divides neither one. The most important application of the ''p''-adic order is in constructing the field of ''p''-adic numbers. It is also applied toward various more elementary topics, such as the distinction between singly and doubly even numbers.〔 〕 ==Definition and Properties==
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