Let {wn}1∞ be a bounded sequence of complex numbers. The unique operator T on l2 defined by T(x0,x1,x2,…)=(w1x1,w2x2,w3x3,…) is called a backward weighted shift. In this paper, it is shown that T is cyclic if and only if {wn}1∞ has at most one term equal to zero; cyclic vectors of certain special weighted shifts are discussed; and it is also pointed out that there are something wrong in the contents of theorems in [1]. The results are extensions to those in [1]. |