This article is cited in 9 papers

Uniqueness and nonuniqueness of the solution to the problem of determining the source in the heat equation

A. M. Denisov

Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia

Abstract: An initial-boundary value problem for the two-dimensional heat equation with a source is considered. The source is the sum of two unknown functions of spatial variables multiplied by exponentially decaying functions of time. The inverse problem is stated of determining two unknown functions of spatial variables from additional information on the solution of the initial-boundary value problem, which is a function of time and one of the spatial variables. It is shown that, in the general case, this inverse problem has an infinite set of solutions. It is proved that the solution of the inverse problem is unique in the class of sufficiently smooth compactly supported functions such that the supports of the unknown functions do not intersect. This result is extended to the case of a source involving an arbitrary finite number of unknown functions of spatial variables multiplied by exponentially decaying functions of time.

Key words: heat equation, unknown source, inverse problem, uniqueness of solutions, nonuniqueness of solutions.

UDC: 519.632.8

Received: 18.11.2015

DOI: 10.7868/S0044466916100069

 English version: Computational Mathematics and Mathematical Physics, 2016, 56:10, 1737–1742

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