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Questions on the calculus of variations, which deals with the optimization of functionals mostly defined on infinite dimensional spaces.

4 votes
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Why can every twist map be realized as the time-1 map of a time-dependent Hamiltonian?

if have problems getting my head around the following claim made by Moser in "Monotone twist mappings and the calculus of variations" and Gole in "Symplectic twist maps". Setting: Let $F : \mathbb{R …