华南师范大学学报(自然科学版)
華南師範大學學報(自然科學版)
화남사범대학학보(자연과학판)
JOURNAL OF SOUTH CHINA NORMAL UNIVERSITY (NATURAL SCIENCE EDITION)
2013年
5期
13-18
,共6页
周期微分方程%收敛指数%小函数
週期微分方程%收斂指數%小函數
주기미분방정%수렴지수%소함수
differential equation with periodic coefficients%exponent of convergence%function of small growth
研究了二阶线性周期微分方程f″+[P1(ez)+P2(e-z)]f′+[Q1(ez)+Q2(e-z)]f =0和 f″+[P1(ez)+P2(e-z)]f′+[Q1(ez)+Q2(e-z)]f=R1(ez)+R2(e-z)的解以及它们的一阶导数、二阶导数、微分多项式与小函数之间的关系,其中Pj(z)、Qj(z)及Rj(z)(j=1,2)是关于z的多项式。
研究瞭二階線性週期微分方程f″+[P1(ez)+P2(e-z)]f′+[Q1(ez)+Q2(e-z)]f =0和 f″+[P1(ez)+P2(e-z)]f′+[Q1(ez)+Q2(e-z)]f=R1(ez)+R2(e-z)的解以及它們的一階導數、二階導數、微分多項式與小函數之間的關繫,其中Pj(z)、Qj(z)及Rj(z)(j=1,2)是關于z的多項式。
연구료이계선성주기미분방정f″+[P1(ez)+P2(e-z)]f′+[Q1(ez)+Q2(e-z)]f =0화 f″+[P1(ez)+P2(e-z)]f′+[Q1(ez)+Q2(e-z)]f=R1(ez)+R2(e-z)적해이급타문적일계도수、이계도수、미분다항식여소함수지간적관계,기중Pj(z)、Qj(z)급Rj(z)(j=1,2)시관우z적다항식。
The relation between solutions of second order linear differential equations with periodic coefficients f″+[P1(ez)+P2(e-z)]f′+[Q1(ez)+Q2(e -z)]f=0 and f″+[P1(ez) +P2(e-z)]f′+[Q1(ez) +Q2(e-z)]f=R1(ez)+R2(e-z), their 1th derivatives, their second derivatives, their differential polynomials with functions of small growth is investigated, where Pj(z), Qj(z),Rj(z)(j=1,2) are polynomials.