<正>Traditional ligand-field theory has to be improved by taking into account both pure electronic contribution and electron-phonon interaction one (including l
<正> Quantum statistical properties of the binomial field interacting with the two entangled atoms are investi-gated for the different initial conditions.It is
<正>We show that there is a quantum Sl_q(2) group symmetry in Hofstadter problem on square lattice.The cyclic representation of the quantum group is discussed a