FLASK 发表于 2025-3-26 23:16:37

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observatory 发表于 2025-3-27 03:32:26

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gusher 发表于 2025-3-27 08:04:17

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事先无准备 发表于 2025-3-27 20:05:14

Nichtlineare Differentialgleichungenequations for which the Lagrangian viewpoint, even if applicable, no longer is appropriate or natural to the problem. In this case, the Hamiltonian formulation of systems of evolution equations assumes the natural variational role for the system.

改变 发表于 2025-3-28 01:59:57

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查看完整版本: Titlebook: Applications of Lie Groups to Differential Equations; Peter J. Olver Textbook 1993Latest edition Springer-Verlag New York, Inc. 1993 CON_D