%0 Journal Article %T The equivalence between the Hamiltonian and the Lagrangian formulations for the parametrization invariant theories %A Sami I. Muslih %J Physics %D 2001 %I arXiv %X The link between the tratment of singular Lagrangians as field systems and the canonical Hamiltonian approach is studied. It is shown that the singular Lagrangians as field systems are always in exact agreement with the canonical approach for the parametrization invariant theories. %U http://arxiv.org/abs/math-ph/0102019v1