<正> In this paper,by using the symmetry method,the relationships between new explicit solutions and oldones of the(2+1)-dimensional Kaup-Kupershmidt(KK)equatio
<正> We find that a kind of atomic coherent state,formed as exp[ζJ_+-ζ~*J_-] |00〉,when the SU(2) generatorsJ± are taken as Fan's form,J_+=(1/2)(a_1-