Abstract
Let u be a solution of the following boundary-value problem: u¦Γ = 0, where Γ is a closed convex curve and Δu = −1 in the region D bounded by Γ. Then u has only one local maximum, and all its level curves are convex.
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M. Morse, Topological Methods in the Theory of Functions of a Complex Variable, Princeton Press, Princeton (1947).
P. S. Aleksandrov, Lectures on Analytic Geometry [in Russian], Moscow (1968).
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Translated from Matematicheskie Zametki, Vol. 9, No. 1, pp. 89–92, January, 1971.
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Makar-Limanov, L.G. Solution of Dirichlet's problem for the equation Δu =−1 in a convex region. Mathematical Notes of the Academy of Sciences of the USSR 9, 52–53 (1971). https://doi.org/10.1007/BF01405053
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DOI: https://doi.org/10.1007/BF01405053