Inthisarticle,westudydelaydifferentialequationshaving forms x' (t)+ P (t) x (t-tau) - Q (t) x (t - sigma) = 0 [x(t) - R(t) x (t-rho)]' + P(t) x (t-tau) = 0 and [x(t) - R(t) x (t-rho)]' + P(t) x (t-tau)-Q(t) x (t-sigma)=0, whereP,Q,R is an element of C ([t(0), infinity),R+ )and tau,sigma,rho >= 0. We use recursive methods to obtain new oscillation criterions.
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Univ S China, Dept Math, Hengyang 421001, Hunan, Peoples R China
Hunan Normal Univ, Dept Math, Changsha 410081, Hunan, Peoples R ChinaUniv S China, Dept Math, Hengyang 421001, Hunan, Peoples R China
Guan, Kaizhong
Shen, Jianhua
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Hangzhou Normal Univ, Dept Math, Hangzhou 310036, Zhejiang, Peoples R China
Coll Huaihua, Dept Math, Huaihua 418008, Hunan, Peoples R ChinaUniv S China, Dept Math, Hengyang 421001, Hunan, Peoples R China
机构:
Hunan Normal Univ, Dept Math, Changsha 410081, Hunan, Peoples R China
Coll Huaihua, Dept Math, Huaihua 418008, Hunan, Peoples R ChinaHunan Normal Univ, Dept Math, Changsha 410081, Hunan, Peoples R China
Shen, Jianhua
Zou, Ziran
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Hunan Normal Univ, Dept Math, Changsha 410081, Hunan, Peoples R ChinaHunan Normal Univ, Dept Math, Changsha 410081, Hunan, Peoples R China
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Cent S Univ Technol, Dept Math Appl, Changsha 410083, Hunan, Peoples R ChinaCent S Univ Technol, Dept Math Appl, Changsha 410083, Hunan, Peoples R China
Tang, XH
Yu, JS
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机构:Cent S Univ Technol, Dept Math Appl, Changsha 410083, Hunan, Peoples R China