数列{nsin n}是无界量但不是无穷大量的一种证明

A proof of the proposition"the sequence{nsinn}is unbounded, but it isn't infinite"

文章利用Dirichlet的一个引理给出了命题"数列{nsinn}是无界量但不是无穷大量"的一种证明.

In this note, we give a proof of the proposition “the sequence { nsinn} is unbounded,but it isn′t infinite” by Dirichlet lemma.