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数列是一种特殊的函数,一种定义在正整数集(或其子集)上的函数,因此也具有单调性,可用函数的思想和方法去研究．对于数列{an}而言,若anan+1,则其为递减数列,若
A sequence of numbers is a special kind of function, a function defined on a set of positive integers (or a subset thereof), and therefore has a monotonicity, and can be studied using the ideas and methods of the functions. For the sequence {an}, if anan+1, it is a decreasing sequence, if