%0 Journal Article %T Dynamics determines geometry %A Sergio A. Hojman %A J. Gamboa %A F. Mendez %J Physics %D 2012 %I arXiv %R 10.1142/S0217732312501866 %X The inverse problem of calculus of variations and $s$-equivalence are re-examined by using results obtained from non-commutative geometry ideas. The role played by the structure of the modified Poisson brackets is discussed in a general context and it is argued that classical $s$-equivalent systems may be non-equivalent at the quantum mechanical level. This last fact is explicitly discussed comparing different approaches to deal with the Nair-Polychronakos oscillator. %U http://arxiv.org/abs/1204.3281v1