摘要
<正> In [1], C. C. Cowen proved the following Theorem C: If f= h(?)u and g= h(?)v, then the Toeplitz operators T_f and T_g are unitarily equivalent to each other (denoted by T_f≌ T_g), where h∈L~∞((?)D), u and v are inner functions of the same order. Also in [1], Cowen raised the following questions: (Ⅰ) When does the converse
基金
Project supported by the Science Fund of the Chinese Academy of Sciences.
