A new C~* -algebra E+E_* is established. It contains the large Hankel algebra N~G produced by all Toeplitz operators and......

设G为一个torsion一free的离散群， (G，G+)为一个拟序群。记TG+(G)为相应的T0eplitz算子代数，K( 2(G+))为 2(G+)上的紧算子全体。本文......