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JOURNALS // Zhurnal Vychislitel'noi Matematiki i Matematicheskoi Fiziki // Archive

Zh. Vychisl. Mat. Mat. Fiz., 2025 Volume 65, Number 12, Pages 2054–2063 (Mi zvmmf12106)

Partial Differential Equations

Construction of barriers for singularly perturbed parabolic problems with cubic nonlinearities taking into account the inflection point

A. I. Denisov, I. V. Denisov

Tula State Pedagogical University

Abstract: An initial boundary value problem for singularly perturbed parabolic equations with cubic nonlinearities is considered in a rectangle. The inflection point of the cubic parabola is assumed to be located to the left of the root of the degenerate equation. The nonlinear method of angular parabolic functions is used to construct a complete asymptotic expansion of the solution to the problem and prove its uniformity in a closed rectangle with respect to a small parameter. This work completes the study of singularly perturbed parabolic problems with cubic nonlinearities.

Key words: boundary layer, asymptotic solution expansion, singularly perturbed equation.

UDC: 519.633

Received: 20.06.2025
Revised: 25.08.2025
Accepted: 19.09.2025

DOI: 10.7868/S3034533225120076


 English version:
Computational Mathematics and Mathematical Physics, 2025, 65:12, 2928–2937

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© Steklov Math. Inst. of RAS, 2026