<正> Generalized Yang-Mills theory has a covariant derivative which contains both vector and pseudoscalargauge bosons.Based on this theory,we construct a U(4) s
<正> We introduce a kind of generalized Wigner operator,whose normally ordered form can lead to the bivariatenormal distribution in p-q phase space.While this b
<正> The system of the Hamiltonian involving a driving part,a single mode part,and a two-mode squeezedone and a two-mode coupled one is discussed using the Lewi