Mei symmetry and conserved quantity of Tzénoff equations for nonholonomic systems
非完整系统Tzénoff方程的Mei对称性和守恒量

The Mei symmetry of Tzénoff equations for nonholonomic systems under the infinitesimal transformation of groups is studied in this paper. The definition and the criterion equations of the symmetry are given. If the symmetry is a Lie symmetry, then the Hojman conserved quantity of the Tzénoff equation can be obtained by the Mei symmetry.