Abstract
By writing the variational principle
one expresses the fact that a certain functional J, characteristic of the system considered, is stationary for a “natural” system. This property leads to the well-known Euler-Lagrange equations of the system.
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Joachain, C.J. (1968). Variational Methods in Scattering Theory. In: Ramakrishnan, A. (eds) Symposia on Theoretical Physics and Mathematics 8. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-7721-4_6
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