Maximal Abelian von Neumann Algebras and Toeplitz Operators with Separately Radial Symbols

Abstract

This paper mainly concerns abelian von Neumann algebras generated by Toeplitz operators on weighted Bergman spaces. Recently a family of abelian w * -closed Toeplitz algebras has been obtained (see [5,6,7,8]). We show that this algebra is maximal abelian and is singly generated by a Toeplitz operator with a "common" symbol. A characterization for Toeplitz operators with radial symbols is obtained and generalized to the high dimensional case. We give several examples for abelian von Neumann algebras in the case of high dimensional weighted Bergman spaces, which are different from the one dimensional case.

C*-Algebra Generated by Angular Toeplitz Operators on the Weighted Bergman Spaces Over the Upper Half-Plane

“…Huang [13] proved that if T ∈ B(L 2 (R)) commutes with the multiplication operator M ϕ , where ϕ is a bounded strictly increasing (or decreasing) function on R, then T = M ψ , for some ψ ∈ L ∞ (R). Now, since each angular Toeplitz operator T a is unitarily equivalent to the multiplication operator M γa , the above Huang result implies that the von Neumann algebra W * (T λ (A ∞ )) generated by T λ (A ∞ ) is maximal.…”