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Gevrey Order and Summability of Formal Series Solutions of Certain Classes of Inhomogeneous Linear Integro-Differential Equations with Variable Coefficients

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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

  1. We denote \(\widetilde {f}\) with a tilde to emphasize the possible divergence of the series \(\widetilde {f}\).

  2. A subsector Σof a sector Σis said to be a proper subsector and one denotes Σ ⋐Σif its closure in \(\mathbb {C} \)is contained in Σ∪{0}.

  3. Relations (4.1) and (4.2) imply indeed that qp κ ≤−1 for all \(i\in \mathcal {K}\) and qQ i .

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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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