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About-Positivity Properties of Time-Invariant Linear Systems Subject to Point Delays

Journal of Inequalities and Applications volume 2007, Article number: 025872 (2007) Cite this article

Abstract

This paper discusses nonnegativity and positivity concepts and related properties for the state and output trajectory solutions of dynamic linear time-invariant systems described by functional differential equations subject to point time delays. The various nonnegativities and positivities are introduced hierarchically from the weakest one to the strongest one while separating the corresponding properties when applied to the state space or to the output space as well as for the zero-initial state or zero-input responses. The formulation is first developed by defining cones for the input, state and output spaces of the dynamic system, and then extended, in particular, to cones being the three first orthants each being of the corresponding dimension of the input, state, and output spaces.

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  1. Departamento de Electricidad y Electronica, Instituto de Investigación y Desarrollo de Procesos, Facultad de Ciencias, Universidad del País Vasco, Campus de Leioa (Bizkaia), Aptdo. 644 de Bilbao, Bilbao, 48080, Spain

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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De la Sen, M. About-Positivity Properties of Time-Invariant Linear Systems Subject to Point Delays. J Inequal Appl 2007, 025872 (2007). https://doi.org/10.1155/2007/25872

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