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arXiv 0705.4299math.NTmath.CO
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抽象因素

Abstract factorials

Angelo B. Mingarelli

摘要:

在整数环的背景下定义了抽象商的交换半群。我们研究这些因子是为了它们本身,不管它们是否与整数集合有关。给定一个正整数的子集X,我们构造一个“阶乘集”,用它可以定义X上的大量抽象阶乘。我们研究了可能的平等的连续因子,二分法涉及的限制优势的比例连续因子,我们提供了许多例子概述了随后的理论的应用;处理素数,斐波那契数,并高度合数等一组整数的例子。我们的一个结果表明,给定任何抽象阶乘,其阶乘的倒数的级数总是收敛于一个无理数。因此,例如,对于任何正整数k,从1到n的数的除数的累积积的k次幂的倒数的级数是无理数。

英文摘要:

A commutative semigroup of abstract factorials is defined in the context of the ring of integers. We study such factorials for their own sake, whether they are or are not connected to sets of integers. Given a subset X of the positive integers we construct a "factorial set" with which one may define a multitude of abstract factorials on X. We study the possible equality of consecutive factorials, a dichotomy involving the limit superior of the ratios of consecutive factorials and we provide many examples outlining the applications of the ensuing theory; examples dealing with prime numbers, Fibonacci numbers, and highly composite numbers among other sets of integers. One of our results states that given any abstract factorial the series of reciprocals of its factorials always converges to an irrational number. Thus, for example, for any positive integer k the series of the reciprocals of the k-th powers of the cumulative product of the divisors of the numbers from 1 to n is irrational.

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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