Abstract
The delay system
$$x(t){\text{ }} = {\text{ }}Ax(t){\text{ }} + {\text{ }}Bx(t - r)$$
is considered. The necessary and sufficient conditions of the existence of a kind of Liapunov functional for the system are given.
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References
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Zhang, S., Zheng, Z. The existence of a liapunov functional for linear delay system. Appl. Math. Chin. Univ. 17, 273–276 (2002). https://doi.org/10.1007/s11766-002-0004-z
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DOI: https://doi.org/10.1007/s11766-002-0004-z