山东大学学报(理学版)
山東大學學報(理學版)
산동대학학보(이학판)
Journal of Shandong University (Natural Science)
2015年
10期
81-88
,共8页
正周期解%奇异耦合系统%弱奇异性%Schauder 不动点定理
正週期解%奇異耦閤繫統%弱奇異性%Schauder 不動點定理
정주기해%기이우합계통%약기이성%Schauder 불동점정리
positive periodic solutions%singular coupled system%weak singularity%Schauders fixed point theorem
运用 Schauder 不动点定理研究了二阶非自治奇异耦合系统{x″+a1(t)x =f1(t,y(t))+e1(t), y″+a2(t)y =f2(t,x(t))+e2(t )正周期解的存在性,其中 ai,ei∈L1(R/TZ,R),fi∈Car(R/TZ ×(0,∞),R),即fi |[0,T]:[0,T]×(0,∞)→R 是L1-Carathéodory 函数(i =1,2),并且 f1,f2分别在 y =0,x =0处允许有奇性。在扰动项积分值符号同正、同负和异号的情况下,分别获得了该奇异耦合系统存在正周期解的条件。
運用 Schauder 不動點定理研究瞭二階非自治奇異耦閤繫統{x″+a1(t)x =f1(t,y(t))+e1(t), y″+a2(t)y =f2(t,x(t))+e2(t )正週期解的存在性,其中 ai,ei∈L1(R/TZ,R),fi∈Car(R/TZ ×(0,∞),R),即fi |[0,T]:[0,T]×(0,∞)→R 是L1-Carathéodory 函數(i =1,2),併且 f1,f2分彆在 y =0,x =0處允許有奇性。在擾動項積分值符號同正、同負和異號的情況下,分彆穫得瞭該奇異耦閤繫統存在正週期解的條件。
운용 Schauder 불동점정리연구료이계비자치기이우합계통{x″+a1(t)x =f1(t,y(t))+e1(t), y″+a2(t)y =f2(t,x(t))+e2(t )정주기해적존재성,기중 ai,ei∈L1(R/TZ,R),fi∈Car(R/TZ ×(0,∞),R),즉fi |[0,T]:[0,T]×(0,∞)→R 시L1-Carathéodory 함수(i =1,2),병차 f1,f2분별재 y =0,x =0처윤허유기성。재우동항적분치부호동정、동부화이호적정황하,분별획득료해기이우합계통존재정주기해적조건。
Using Schauders fixed point theorem,we study the existence of positive periodic solutions for second order non-autonomous singular coupled systems x″+a1 (t)x =f1 (t,y(t))+e1 (t), y″+a2 (t)y =f2 (t,x(t))+e2 (t ), where ai,ei ∈ L1 (R/TZ,R),fi ∈ Car (R/TZ ×(0,∞),R),that is,fi |[0,T]:[0,T]×(0,∞)→ R are L1 -Carathéodory functions(i =1,2),and f1 ,f2 may be singular at y =0,x =0,respectively.The existence of positive periodic solutions for the singular coupled systems are obtained under the conditions that the signs of integral disturbance terms are positive,or negative,or different.