Titlebook: Differential Equations, Chaos and Variational Problems; Vasile Staicu Conference proceedings 2008 Birkh?user Basel 2008 Boundary value pro

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https://doi.org/10.1007/978-3-642-41166-3, which asserts all the first-order necessary conditions for the basic problem in the calculus of variations, and a proof of Theorem 3.1, which is the Pontryagin maximum principle in a classical context.