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To the problem of observability for nonlinear systems with time delay. (English) Zbl 1147.93318
Summary: Several kinds of observability notions are introduced for nonlinear time-delay systems and comparative analysis of such notions is presented. Sufficient conditions for observability are given. Special attention is paid to the two-dimensional system case. The results obtained are illustrated by examples.
MSC:
93B07 Observability
93C10 Nonlinear systems in control theory
93C23 Control/observation systems governed by functional-differential equations
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