Operator algebras generated by left invertibles

Abstract

Operator algebras generated by partial isometries and their adjoints form the basis for some of the most well studied classes of C*-algebras. The primary object of this paper is the norm-closed operator algebra generated by a left invertible $T$ together with its Moore-Penrose inverse $T^{†}$. We denote this algebra by ${\mathfrak{A}}_T$. In the isometric case, $T^{†}=T^{\ast }$ and ${\mathfrak{A}}_T$ is a representation of the Toeplitz algebra. Of particular interest is the case when $T$ satisfies a non-degeneracy condition called analytic. We show that $T$ is analytic if and only if $T^{\ast }$ is Cowen-Douglas. When $T$ is analytic with Fredholm index $-1$, the algebra ${\mathfrak{A}}_T$ contains the compact operators, and any two such algebras are boundedly isomorphic if and only if they are similar.