本短文用简单方法证明了线性非时变系统不变性的充要条件。

In this short paper the necessary and sufficient conditions for invariance of linear time-invariant systems are proved by a simple method.

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本文讨论了船舶线性非时变系统及线性时变系统运动的稳定。

In this paper, The stability of a ship with linear time variation and non-time variation motion system was discussed.

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在传统的算子理论基础上，建立了电路的算子模型，提出了求解线性非时变系统全响应的一种新方法。

Basing on traditional operator theory, operator madel for a circuit is established, and a new method for the solution of response of linear time invariance system is introduced.

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