On Oscillation Criteria of Fourth Order Linear Differential Equations

The paper deals with oscillation criteria of fourth order linear differential equations with quasi-derivatives.     

On oscillatory solutions of fourth order ordinary differential equations

The paper deals with the oscillation of a differential equation L ₄ y + P(t)L ₂ y + Q(t)y 0 as well as with the structure of its fundamental system of solutions.     

经典Sturm-Liouvlle理论的完备和衍生纪念申又枨先生诞辰九十周年

综合评述了Sturm-Liouville理论在近 30年内的若干新发展,主要内容包括如下4个方面:1 由拟导数所生成的微分算子;2 常微分算子自伴性的完全解析描述;3 带权函数的Sturm-Liouville问题(包括右定、左定和不定3种情形);4 Volterra-Stieltjes积分微分算子。     

函数一致连续的几个充分条件

得到了函数一致连续的几个充分条件.