circulation of vector field

Let T be in the commutant of Volterr a operator V, by construction and calculation, it is proved that if the function f(x)=1 is a cyclic vector of T, then A′(V)=A′(T).

对于与Volterra算子V交换的算子T,通过构造和计算,证明了:如果f(x)=1是T的一个循环向量,则A′(V)=A′(T)。