那么由定义可知对每一对i,i都有 ingo0 (i=1,2,…,;j=1,2,…,n) 从而有 m22a,-o0 k0 i=1j=1 上式记为 lim4-=0 d by trial of Print2Flash Visit This document is produced by trial version of Print2Flash. Visit www.print2flash.com for more information