摘要
For each non-isospectral Ablowitz-Ladik equation a strong symmetry operator is given.The strong symmetry contains time variable explicitly and by means of it two sets of symmetries are generated.Functional derivative formulae between the strong symmetry and symmetries are derived,by which the obtained symmetries are shown to compose a centerless Kac-Moody-Virasoro algebra.Master symmetries for non-isospectral Ablowitz-Ladik equations are also discussed.
作者
WU Hua
ZHANG Da-Jun
吴华;张大军(Department of Mathematics,Shanghai University,Shanghai 200444)
基金
Supported by the National Natural Science Foundation of China under Grant Nos 60874039 and 11071157,and the Shanghai Leading Academic Discipline Project(No J50101).
