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The Variational Principles of Mechanics Cornelius Lanczos
Publisher: Dover Publications

In General Relativity we call this “the geodesic path”. The Variational Principles of Mechanics. Linear function of the surface potential φ, but depends non-linear. Conservation Laws for Non-Potential Operators . In Quantum Mechanics we call this “the most probable path”. There are many other versions for deriving the equations of motion from variational calculus, see: Spivak, M. The list goes on, all coming from variational principles, i.e. The variational principles of mechanics - Cornelius Lanzcos. Leibniz' “best possible world”. University of Toronto Press, Toronto. Vera Lia Marcondes Criscuolo de Almeida.