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EXISTENCE OF STRICTLY DECREASING POSITIVE SOLUTIONS OF LINEAR DIFFERENTIAL EQUATIONS OF NEUTRAL TYPE

机译:中性类型线性微分方程正面解的存在性

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摘要

The paper is concerned with a linear neutral differential equation y(t) =-c(t)y(t-τ(t)) + d(t)y(t-δ(t)) where c : [t0,∞)→ (0,∞), d: [t0,∞) →[0,∞), t0∈ R and τ,δ: [t0,∞) → (0, r], r∈ R, r >0 are continuous functions. A new criterion is given for the existence of positive strictly decreasing solutions. The proof is based on the Rybakowski variant of a topological Wazewski principle suitable for differential equations of the delayed type. Unlike in the previous investigations known, this time the progress is achieved by using a special system of initial functions satisfying a so-called sewing condition. The result obtained is extended to more general equations. Comparisons with known results are given as well.
机译:本文涉及线性中性微分方程Y(t)= -c(t)y(t-τ(t))+ d(t)y(t-Δ(t)),其中c:[t0,∞ )→(0,∞),d:[t0,∞)→[0,∞),t0∈r和τ,δ:[t0,∞)→(0,r],r∈r,r> 0是连续函数。提供了一个新的标准来存在正度严格减少的解决方案。该证据基于拓扑Wazewski原理的Rybakowski变体,适用于延迟类型的微分方程。与已知的先前调查相比,这次进展情况通过使用满足所谓的缝制条件的初始函数的特殊系统来实现。所获得的结果延伸到更通用的方程。还提供了具有已知结果的比较。

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