Titlebook: Semiconcave Functions, Hamilton-Jacobi Equations, and Optimal Control; Piermarco Cannarsa,Carlo Sinestrari Textbook 2004 Birkh?user Boston

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Singularities of Semiconcave Functions,gular points for ., which is called . and is denoted here by ∑(.). As we have already remarked, the singular set of a semiconcave function has zero measure by Rademacher’s theorem. However, we will see that much more detailed properties can be proved.

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