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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2012.10726math.DS
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线性时滞微分方程的稳定性和振动性

Stability and oscillation of linear delay differential equations

John Ioannis Stavroulakis, Elena Braverman

摘要:

时滞微分方程的稳定性与振动性之间有着密切的联系。对于一阶方程$$ x^{\prime}(t)+c(t)x(τ(t))=0,~~t\geq 0, $$,其中$c$是任意符号的局部可积的,$τ(t)\leq t$是勒贝格可测的,$\lim_{t\rightarrow\infty}τ(t)=\infty$,我们得到了与振动速度和稳定性有关的精确结果.从而统一了Myshkis和Lillo的经典结果。我们还概括的$3/2-$稳定性标准的情况下,可测量的参数,提高$1+1/e$的尖锐的$3/2$常数。

英文摘要:

There is a close connection between stability and oscillation of delay differential equations. For the first-order equation $$ x^{\prime}(t)+c(t)x(τ(t))=0,~~t\geq 0, $$ where $c$ is locally integrable of any sign, $τ(t)\leq t$ is Lebesgue measurable, $\lim_{t\rightarrow\infty}τ(t)=\infty$, we obtain sharp results, relating the speed of oscillation and stability. We thus unify the classical results of Myshkis and Lillo. We also generalise the $3/2-$stability criterion to the case of measurable parameters, improving $1+1/e$ to the sharp $3/2$ constant.

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