摘要
运用单调数列的定义,直接判定根式数列{(f(n))^(1/n)}的单调性,在很多情况下不易.由于数列可以看作定义域为N+(或N+的有限子集)的函数.因此,当数列的背景函数具有可导性时,可以通过与其导数有关的一个不等式来判定数列{(f(n))^(1/n)}的单调性.
By applying the definition of series,it is difficult to investigate the monotonicity of the series {(f(n))1/n}.A method for this purpose was presented and some examples were given to show the usefulness of the proposed method.
出处
《宜宾学院学报》
2012年第12期33-35,共3页
Journal of Yibin University
关键词
根式数列
单调性
背景函数
series {(f(n))1/n}
monotonicity
background function