数学物理学报 ›› 1981, Vol. 1 ›› Issue (1): 77-82.
夏道行
Xia Daoxing
摘要: Let H be a complex separable Hilbert space, L(H) be the algebra of all linear bounded operators in H, and SHU be the set of all operators T-U|T|∈L(H) satisfying the following conditions:(ⅰ) the operator U∈L(H) is unitary and (ⅱ)|T|∈L(H),
|T| ≥ U|T|U-1 ≥ 0.