Abstract
For dynamical systems governed by feedback laws, time delays arise naturally in the feedback loop to represent effects due to communication, transmission, transportation or inertia effects. The introduction of time delays in a system of differential equations results in an infinite dimensional state space. The solution operator associated with a differential delay equation is a nonself-adjoint operator defined on a Banach space. This implies that general abstract theorems cannot directly be applied. In this paper we discuss the spectral properties of autonomous and periodic differential delay equations, series expansions of solutions, completeness of eigenvectors and generalized eigenvectors, and solutions of delay equations that decay faster than any exponential.
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Lunel, S.M.V. (2001). Spectral theory for delay equations. In: Borichev, A.A., Nikolski, N.K. (eds) Systems, Approximation, Singular Integral Operators, and Related Topics. Operator Theory: Advances and Applications, vol 129. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8362-7_19
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DOI: https://doi.org/10.1007/978-3-0348-8362-7_19
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