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arXiv 0910.4674math.NT
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关于互素子集和超集

On Relatively Prime Subsets and Supersets

Mohamed El Bachraoui

摘要:

一个正整数A的非空有限集,如果gcd(A)= 1,则A是互素的;如果gcd(A [ fng])= 1,则A与n是互素的. A的与n互素的非空子集的个数为Φ(A,n),基数为k的子集的个数为Φ_k(A,n)。给定正整数l1、l2、m2和n,使得l1 <= l2 <= m2,我们给出Φ([1;m1][[l2;m2]; n)和Phi_k([1;m1] [ [l2;m2]; n)。给定正整数l、m和n,使得l <= m,我们对{l,l+1,.,m}是[l;m]中与n互素的超集的个数,我们计算与n互素的超集的个数。公式也得到相应的超集具有固定的基数。中间的后果包括一个公式的数量互素集与非空的交集与一些固定的一组正整数。

英文摘要:

A nonempty finite set of positive integers A is relatively prime if gcd(A) = 1 and it is relatively prime to n if gcd(A [ fng) = 1. The number of nonempty subsets of A which are relatively prime to n is Φ(A, n) and the number of such subsets of cardinality k is Φ_k(A, n). Given positive integers l1, l2, m2, and n such that l1 <= l2 <= m2 we give Φ([1;m1][[l2;m2]; n) along with Phi_k([1;m1] [ [l2;m2]; n). Given positive integers l;m, and n such that l <= m we count for any subset A of {l,l+1,...,m} the number of its supersets in [l;m] which are relatively prime and we count the number of such supersets which are relatively prime to n. Formulas are also obtained for corresponding supersets having fixed cardinalities. Intermediate consequences include a formula for the number of relatively prime sets with a nonempty intersection with some fixed set of positive integers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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