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Mat. Zametki, 2025 Volume 117, Issue 6, Pages 910–921 (Mi mzm14397)

Calculation of the asymptotics of the solution of the inhomogeneous heat equation by the auxiliary parameter method

S. V. Zakharov

N.N. Krasovskii Institute of Mathematics and Mechanics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg

Abstract: The asymptotic behavior of the solution to the Cauchy problem for an inhomogeneous heat equation with a right-hand side that has a self-similar asymptotic behavior at infinity is investigated. Using the auxiliary parameter method and the regularization of singularities of the integrands, we obtain an asymptotic approximation of the solution in the form of an Erdélyi series in half-integer powers of the time variable with coefficients depending on the self-similar variable and the logarithm of time.

Keywords: heat equation, Cauchy problem, auxiliary parameter method, asymptotics, self-similarity.

UDC: 517.956.8+517.958

MSC: 35C20, 35K05

Received: 05.06.2024

DOI: 10.4213/mzm14397


 English version:
Mathematical Notes, 2025, 117:6, 1023–1033

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© Steklov Math. Inst. of RAS, 2026