1. G. H. Katzin andJ. Levine:Journ. Math. Phys.,9, 8 (1968).
2. G. H. Katzin andJ. Levine:Colloquium Mathematicum (Wroclaw),26, 21 (1972).
3. G. H. Katzin:Journ. Math. Phys.,14 (1973), to appear.
4. The symbol D/dt indicates absolute differentiation with respect to the Christoffel symbols based upon the metric tensorg ij of the configuration spaceV n . Lower–case Latin indices range from 1 ton. Summation notation is used throughout.V(x) is the potential energy. Partial differentiation is indicated by a comma (,).
5. See for exampleC. W. Kilmister:Hamiltonian Dynamics (New York, 1965).