Abstract
In this article, we investigate Gevrey and summability properties of formal power series solutions of certain classes of inhomogeneous linear integro-differential equations with analytic coefficients in a neighborhood of \((0,0)\in \mathbb {C}^{2}\). In particular, we give necessary and sufficient conditions under which these solutions are convergent or are k-summable, for a convenient positive rational number k, in a given direction.
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Notes
We denote \(\widetilde {f}\) with a tilde to emphasize the possible divergence of the series \(\widetilde {f}\).
A subsector Σof a sector Σ′is said to be a proper subsector and one denotes Σ ⋐Σ′if its closure in \(\mathbb {C} \)is contained in Σ′∪{0}.
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Remy, P. Gevrey Order and Summability of Formal Series Solutions of Certain Classes of Inhomogeneous Linear Integro-Differential Equations with Variable Coefficients. J Dyn Control Syst 23, 853–878 (2017). https://doi.org/10.1007/s10883-017-9371-x
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DOI: https://doi.org/10.1007/s10883-017-9371-x