On Liapunov-Type Inequality for Third-Order Differential Equations☆

Abstract In this paper, a Liapunov-type inequality has been derived for a class of third-order differential equations of the form, y‴ + p t y = 0, wherepis a real-valued continuous function on [0, ∞). The nature of the distance between consecutive two zeros or three zeros has been studied with the help of the inequality.