first appeared in [1] and now has wide applications in the operator theory (see e.g. [2]). Its infinite-dimensional analogue for Hilbert spaces has been investigated in [3], where the authors used homogeneous Hilbert–Schmidt polynomials instead of power addends cnξn. In the given paper, a Banach infinite-dimensional generalization, called approximable Wiener algebras, is considered. Namely, the approximable polynomials, as power addends in Taylor series instead of the Hilbert–Schmidt polynomials, are used.
Quantized sectorial operators acting on approximable Wiener algebras are the main object of our research. We investigate the following problem: is the quantized operator sectorial if so is the initial operator? A positive solution is given in Theorem 3.4. In Theorem 4.1 an application to a holomorphic calculus of quantized sectorial operators is specified.
For infinite-dimensional holomorphy, we refer the reader to [4] and [5] and for the theory of sectorial operators to [6] and [7].