MODERN PHYSICS LETTERS A, vol.15, no.24, pp.1503-1510, 2000 (SCI-Expanded)
The tensorial form of the Lax pair equations are given in a compact and geometrically transparent form in the presence of Cartan's torsion tensor. Three-dimensional space-times admitting Lax tensors are analyzed in detail. Solutions to Lax tensor equations include interesting examples as separable coordinates and the Toda lattice.