摘要
Ⅰ. INTRODUCTION In this work we investigate the second order linear differential equations (a (t) x′)′ + b(t)x = 0, (L) where a, b:[τ, ∞)→ (0, ∞) are continuous functions. A number of papers have dealt with the stability of the solutions of (L). A. U. Levin solved the stability problems of (L) in the nonoscillatory case and indicated that'basic difficulty is oscil-
基金
Project supported by the National Natural Science Foundation of China
