Variational integrators for degenerate Lagrangians, with application to point vortices
作者： C.W. Rowley , J.E. Marsden
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摘要: … Lagrange equations produce second-order equations, while for degenerate Lagrangians of t.he form (6), they give the first-order equations … T'Q or, on the Lagrangian side, on TQ, while …
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