主要研究延时微分代数方程的渐近稳定性。并利用在一个环形区域边界上对一种相应的调和函数的估计来描述这两种准则。%The asymptotic stability of delay differential-algebraic equations are researched in this pa-per.Two stability criteria described by evaluating a corresponding harmonic function on the boundary of a torus region are presented.
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