具有Ⅳ類功能反應(yīng)的離散非自治捕食系統(tǒng)永久持續(xù)生存性和周期解的存在性.pdf

1、西北師范大學(xué)碩士學(xué)位論文具有IV類功能反應(yīng)的離散非自治捕食系統(tǒng)永久持續(xù)生存性和周期解的存在性姓名：蒲武軍申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：@指導(dǎo)教師：李寶麟2008AbstractThispaperdiscussesdiscretenonautonomouspredatpreysystemwithIVtypefunctionalresponsex(n1)=x(n)exp?r(n)?a(n)x(n)?α(n)y(n)cx2(n)?y(n1)=y(n

2、)exp??e(n)?b(n)y(n)β(n)x(n)cx2(n)?(1)delayeddiscretenonautonomouspredatpreysystemx(n1)=x(n)exp?r(n)?a(n)x(n?l)?α(n)y(n?l)cx2(n?l)?y(n1)=y(n)exp??e(n)?b(n)y(n?l)β(n)x(n?l)cx2(n?l)?.(2)Theauthobtainthepermanenceofthesystem

3、(1)(2)withthehelpofBrouwerfixedpointtheemcontinuationtheemincoincidencedegreetheywederivesufficientrealisticthatguaranteetheexistenceofatleastonepositiveperiodicsolutionfdiscretepredatpreysystem(1)(2)wealsoobtaintheexist