§9.5Sturm-Liuville本征值问题一、问题的引入—已有的本征值问题归类()()0(1)(0)()0XxXxXXl21,2,3,(/),()sin(/)nnnlXxnxln()()0(2)(2)()20,1,2,,()cossinnmmmmAmBmm2(1)2(1)0(3)(1)xyxyllyy有限0,1,2,(1),()()llllyxPxl222(1)2[(1)]0(4)1(1)mxyxyllyxy...