Abstract
Recently, systems of coupled renewal and retarded functional differential equations have begun to play a central role in complex and realistic models of population dynamics. In view of studying the local asymptotic stability of equilibria and (mainly) periodic solutions, we propose a pseudospectral collocation method to approximate the eigenvalues of the evolution operators of linear coupled equations, providing rigorous error and convergence analyses and numerical tests. The method combines the ideas of the analogous techniques developed separately for renewal equations and for retarded functional differential equations. Coupling them is not trivial, due to the different state spaces of the two classes of equations, as well as to their different regularization properties.
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Notes
Different choices are possible for the norm of a product space: as an example, the norm defined as \(\max \{\Vert x \Vert _{X}, \Vert y \Vert _{Y}\}\) is equivalent to (1).
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Acknowledgements
All the authors are members of the Gruppo Nazionale di Calcolo Scientifico (GNCS) of the Istituto Nazionale di Alta Matematica “Francesco Severi” (INdAM). They were supported by the INdAM GNCS project “Approssimazione numerica di problemi di evoluzione: aspetti deterministici e stocastici” (2018) and by the project PSD_2015_2017_DIMA_PRID_2017_ZANOLIN “SIDIA – SIstemi DInamici e Applicazioni” of the Department of Mathematics, Computer Science and Physics of the University of Udine. D.L. was supported also by the PhD course in Computer Science, Mathematics and Physics of the Department of Mathematics, Computer Science and Physics of the University of Udine.
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Breda, D., Liessi, D. Approximation of eigenvalues of evolution operators for linear coupled renewal and retarded functional differential equations. Ricerche mat 69, 457–481 (2020). https://doi.org/10.1007/s11587-020-00513-9
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DOI: https://doi.org/10.1007/s11587-020-00513-9
Keywords
- Renewal equations
- Retarded functional differential equations
- Stability
- Equilibria and periodic solutions
- Evolution operators
- Eigenvalue approximation
- Pseudospectral collocation