一种特殊情形的一阶焦点量公式

ONE-ORDER FOCAL VALUES FORMULA FOR A SPECIAL CASE

为了定性地研究微分方程系统，往往要讨论焦点量问题。利用著名的ＢａｙｍｕＨ定理，讨论一类微分方程系统的焦点量。根据这类系统的某些特性，简化了Ａｒｎｏｌｄ公式，从而对这类系统得出了简便的一阶焦点量公式。

We often discuss the focal values problem to study the system of ordimary differential equations. This paper discusses the focal values problem of a kind of differential equation system using the famous Faymuh Theorem. According to some specific properties of this kind of system. the paper simplifies Arnold formula. then gets a simple and convenient one--order focal values formula.