<正> In this paper,the direct symmetry method is extended to the Lax pair of the ANNV equation.As a result,symmetries of the Lax pair and the ANNV equation are
<正>By using a six-dimensional matrix Lie algebra [Y.F.Zhang and Y.Wang,Phys.Lett.A 360 (2006) 92], three induced Lie algebras are constructed.One of them is ob
<正> After introducing some of the basic definitions and results from the theory of groupoid and Lie algebroid,we investigate the discrete Lagrangian mechanics