A partially explicit construction of a Lagrangian for an n -dimensional Newtonian system of equations of motion is given. Extra variables used in the construction are spontaneously reduced by the constraints resulting from degeneracy of the proposed Lagrangian, so that only the variables that appear in the original system of equations remain. An explicit example of a Lagrangian for a system not satisfying Helmholtz conditions is given.
Hebda, Piotr W. and Hebda, Beata A., "Spontaneous Dimension Reduction and the Existence of a Local Lagrangian for Given n-Dimensional Newtonian Equations of Motion" (2015). Faculty Publications. 1.
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