method is based on his fundamental theorem [Z], which was considerably supplemented by
Liapunov [3]. The stability of steady motions can also be studied on the basis of the
Liapunov stability theorem [4]; the latter involves cons~ ucting the Liapunov function from the
integrals of the equations of motion by the Chetaev method [4-S]. These two approaches are
basic to the investigation of the stability of steady motions. We intend to show that under …