We propose a generalization of the standard Lax equation defined by means o
f an arbitrary action of a Lie algebra on a matrix differential manifold. W
e analyze properties of obtained equation and show examples with physical a
pplications. In particular, certain constructions of Hamiltonian subclasses
of this generalized Lax equation are described. (C) 2001 Elsevier Science
B.V. all rights reserved.