Oscillation of even order linear functional differential equations with deviating arguments of mixed type

Oscillation of even order linear functional differential equations with deviating arguments of mixed type
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混合型偏差变元偶次线性泛函微分方程的振动

DOI:
10.1016/0022-247x(84)90253-1
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发表时间:
1984
期刊:
影响因子:
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通讯作者:
T. Kusano
T. Kusano
中科院分区:
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文献类型:
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作者:
T. Kusano

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其中n是偶数,p:[0,ω)+ R和g:[0,00)+ R是连续的,p(t)> 0,g(t)是非减的并且Cm,ω,g(t)= 03。通过适当的Eq。(1)我们的意思是一个函数x:[TX,00)-+ R,它对所有充分大的t满足(1),对任何T> TX满足sup {lx(t)J:t> T)> 0。我们假设(1)确实有适当的解。如果一个真解具有任意大的零点,则称之为振荡解;否则称之为非振荡解。若x(t)是(1)的非振动解,则存在一个偶数1 E(0,2,.,n}和at,> TX,使得
where n is even, p:[0, co)+ R and g:[O, 00)+ R are continuous, p (t)> 0, g (t) is nondecreasing and Cm,,, g (t)= 03. By a proper solution of Eq.(1) we mean a function x:[TX, 00)-+ R which satisfies (1) for all sufficiently large t and sup {lx (t) J: t> T)> 0 for any T> TX. We make the standing hypothesis that (1) does possess proper solutions. A proper solution is called oscillatory if it has arbitrarily large zeros; otherwise it is called nonoscillatory. If x (t) is a nonoscillatory solution of (l), then there exist an even integer 1 E (0, 2,..., n} and at,> TX such that