Geodesic
The Yekaterinburg heritage of Arlen Mikhailovich Il'in
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 23 (2017) no. 2, pp. 42-66 Cet article a éte moissonné depuis la source Math-Net.Ru

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The main problems formulated by A.M.Il'in and solved by his disciples working now in Yekaterinburg are considered. These problems are related to the method of matched asymptotic expansions used for finding asymptotic solutions of equations with a singular dependence on a small parameter. In addition to boundary value problems for equations of mathematical physics, we consider systems of nonlinear equations and systems of linear equations depending on two small parameters. We also consider problems of finding asymptotic expansions for fundamental solutions of parabolic equations and optimal control problems depending on a small parameter.
Keywords: singularly perturbed problems, asymptotic expansions, small parameter, method of matched asymptotic expansions, optimal control. 
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A. R. Danilin; S. V. Zakharov; O. O. Kovrizhnykh; E. F. Lelikova; I. V. Pershin; O. Yu. Khachay. The Yekaterinburg heritage of Arlen Mikhailovich Il'in. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 23 (2017) no. 2, pp. 42-66. http://geodesic.mathdoc.fr/item/TIMM_2017_23_2_a4/

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