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https://www.sciopen.com/article/10.3934/math.20231129 On the variational principle and applications for a class of damped vibration systems with a small... on the variational principle damped vibration applications class https://cpb.iphy.ac.cn/en/article/doi/10.1088/1009-1963/14/6/001 The discrete variational principle in Hamiltonian formalism and first integrals The aim of this paper is to show that first integrals of discrete equation of motion for Hamiltonian systems can be determined explicitly by investigating the... variational principle hamiltonian formalism first integrals discrete https://ijpr.iut.ac.ir/article_3637.html?lang=en Time-dependent variational principle treatment of quantum phase transition Phase transitions are fundamental phenomena in physics, characterized by abrupt changes in the properties of a system. While classical phase transitions occur... quantum phase transition variational principle time dependent treatment https://aif.centre-mersenne.org/articles/10.5802/aif.2778/ An analogue of the Variational Principle for group and pseudogroup actions of the variational principle analogue group actions