Convex analysis and variational problems
Convex analysis and variational problems
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The classical Kantorovich-Rubinstein theory gives necessary conditions for maxima of linear functionals acting on the space of Lipsehitzian functions. We show analogous results for some nonlinear functionals of Hammerstein type. Our proofs are based on theorems concerning local changes of Lipschitzian functions similar to the McShane extension theorem.