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 Kebangsaan Malaysia, Fac Sci & Technol, Sch Math Sci, Bangi 43600, Selangor, MalaysiaUniv Kebangsaan Malaysia, Fac Sci & Technol, Sch Math Sci, Bangi 43600, Selangor, Malaysia
Ahmed, Fatima N.
Ahmad, Rokiah Rozita
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Univ Kebangsaan Malaysia, Fac Sci & Technol, Sch Math Sci, Bangi 43600, Selangor, MalaysiaUniv Kebangsaan Malaysia, Fac Sci & Technol, Sch Math Sci, Bangi 43600, Selangor, Malaysia
Ahmad, Rokiah Rozita
Din, Ummul Khair Salma
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Univ Kebangsaan Malaysia, Fac Sci & Technol, Sch Math Sci, Bangi 43600, Selangor, MalaysiaUniv Kebangsaan Malaysia, Fac Sci & Technol, Sch Math Sci, Bangi 43600, Selangor, Malaysia
Din, Ummul Khair Salma
Noorani, Mohd Salmi Md
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Univ Kebangsaan Malaysia, Fac Sci & Technol, Sch Math Sci, Bangi 43600, Selangor, MalaysiaUniv Kebangsaan Malaysia, Fac Sci & Technol, Sch Math Sci, Bangi 43600, Selangor, Malaysia
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Academia Militar, Departamento de Ciˆencias Exactas e Naturais Av. Conde Castro Guimarâes, AmadoraJavakhishvili Tbilisi State Univ., University st. 2, Tbilisi