研究了一类四阶Sturm-Liouville问题的特征值关于区间端点、边界条件、方程系数及权函数的连续性和可微性,给出了特征值关于这些参数的微分表达式.
In this paper,we show that the eigenvalues of a class of 4-order Sturm-Liouville problems are continuous and differentiable functions of the endpoints, the boundary conditions,the coefficients and the weight functions. We also find expressions for their derivatives.