Abstract
The notion of moment differentiation is extended to the set of generalized multisums of formal power series via an appropriate integral representation and accurate estimates of the moment derivatives. The main result is applied to characterize generalized multisummability of the formal solution to a family of singularly perturbed moment differential equations in the complex domain, broadening widely the range of singularly perturbed functional equations to be considered in practice, such as singularly perturbed differential equations and singularly perturbed fractional differential equations.
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Funding
The first author is supported by the project PID2019-105621GB-I00 of Ministerio de Ciencia e Innovación, Spain. and by Dirección General de Investigación e Innovación, Consejería de Educación e Investigación of Comunidad de Madrid (Spain), and Universidad de Alcalá under grant CM/JIN/2019-010, Proyectos de I+D para Jóvenes Investigadores, Univ. de Alcalá 2019.
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Lastra, A., Michalik, S. & Suwińska, M. Multisummability of Formal Solutions for a Family of Generalized Singularly Perturbed Moment Differential Equations. Results Math 78, 49 (2023). https://doi.org/10.1007/s00025-022-01828-9
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DOI: https://doi.org/10.1007/s00025-022-01828-9
Keywords
- Multisummability
- formal solution
- moment estimates
- moment derivatives
- moment differential equations
- singular perturbation