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arXiv 2602.06261math.DS
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一阶中性时滞微分方程的振荡结果:具有多个正负系数

Oscillation results for first order neutral delay differential equations with several positive and negative coefficients

Bolyai Institute, University of Szeged(塞格德大学博莱伊研究所);HUN-REN–SZTE Analysis and Applications Research Group, Bolyai Institute, University of Szeged(塞格德大学博莱伊研究所匈牙利研究网络-塞格德大学分析与应用研究组);National Laboratory for Health Security, University of Szeged(塞格德大学国家安全实验室)

Ábel Garab, Gergő Tóth

AI总结:

本文研究了一阶中性时滞微分方程的振荡问题,提出改进的充分条件,考虑正负系数和时间可变延迟,通过示例验证了结果的适用性。

摘要:

我们为以下形式的中性时滞微分方程提供充分条件,以确保所有解的振荡:[x(t) - Σ_{i=1}^{N_r}R_i(t)x(t - r_i(t))]′ + Σ_{i=1}^{N_p}P_i(t)x(t - τ_i(t)) - Σ_{i=1}^{N_q}Q_i(t)x(t - δ_i(t))=0,其中包含正负项和时间可变延迟。我们的结果改进并推广了文献中已有的若干准则,这些准则处理的是受限情况,如常数延迟或没有负系数。在额外假设下变参数缓慢变化的情况下,我们推导出更严格的振荡条件。我们通过示例展示了我们发现的应用性。

英文摘要:

We provide sufficient criteria for the oscillation of all solutions of neutral delay differential equations of the form \[ \left[x(t) - \sum_{i=1}^{N_r}R_i(t)x(t - r_i(t)) \right]' + \sum_{i=1}^{N_p}P_i(t)x(t - τ_i(t)) - \sum_{i=1}^{N_q}Q_i(t)x(t - δ_i(t))=0, \] with both positive and negative terms and time-variable delays. Our results improve and generalize several existing criteria available in the literature that address restricted cases, such as constant delays or the absence of negative coefficients. Under additional assumptions on slowly varying parameters, we derive sharper oscillation conditions. We demonstrate the applicability of our findings through illustrative examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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