4 citations · 11 across the 28 of their papers we have counts for
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Estimates of formal solutions for some generalized moment partial differential equations
Alberto Lastra, Sławomir Michalik, Maria Suwińska
Using increasing sequences of real numbers, we generalize the idea of formal moment differentiation first introduced by W. Balser and M. Yoshino. Slight departure from the concept…
On a analog of a singularly perturbed problem of irregular type with two complex time variables
Alberto Lastra, Stéphane Malek
Analytic solutions and their formal asymptotic expansions for a family of the singularly perturbed difference-differential equations in the complex domain are constructed. They…
Boundary layer expansions for initial value problems with two complex time variables
Alberto Lastra, Stéphane Malek
We study a family of partial differential equations in the complex domain, under the action of a complex perturbation parameter . We construct inner and outer solutions of the p…
On singularly perturbed linear initial value problems with mixed irregular and Fuchsian time singularities
Alberto Lastra, Stephane Malek
We consider a family of linear singularly perturbed PDE relying on a complex perturbation parameter . As in a former study of the authors (A. Lastra, S. Malek, Parametric Gevrey…