Geodesic
New Equations of Convolution Type Obtained by Replacing the Integral by Its Maximum
Matematičeskie zametki, Tome 71 (2002) no. 1, pp. 18-26 Cet article a éte moissonné depuis la source Math-Net.Ru

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We study the nonlinear equation $$ \max _{\gamma \in \mathbb R}g(\gamma )|\cos (\gamma -\alpha )| =f(\alpha ), $$ where $f(\alpha)$ is a given function and $g(\gamma)$ is the unknown function, to be found in the class of nonnegative continuous $\pi$-periodic functions. This equation arose in the context of an applied problem dealing with the construction of a hydrofoil from given pressure envelopes. Necessary and sufficient conditions for the solvability of the equation, an explicit description of the solution set, and a comparison theorem under changes of the right-hand sides are obtained. Some possible ways of generalization are indicated. 
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F. G. Avkhadiev; D. V. Maklakov. New Equations of Convolution Type Obtained by Replacing the Integral by Its Maximum. Matematičeskie zametki, Tome 71 (2002) no. 1, pp. 18-26. http://geodesic.mathdoc.fr/item/MZM_2002_71_1_a1/

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