摘要
考察了几类正项级数的特点，得到三种简单方便的判别法．据此，对于某些正项级数敛散性的研究可以更为方便、更为精确．
In this paper,characeristics of sevEral positive term serieses are investigated,and three useful criterions are obtained. On these ground,it is more convenient and exact to research convergence and nonconvergence of some serieses with positive terms.
关键词
正项级数
收敛
发散
判别法
导数判别法
positive term series
convergence
nonconvergence
derivative
logarithm.
