A note on operator tuples which are $(m,p)$-isometric as well as $(\mu ,\infty )$-isometric

Abstract

We show that if a tuple of commuting, bounded linear operators $(T_1,...,T_d)\in B(X{)}^d$ is both an $(m,p)$-isometry and a $(\mu ,\infty )$-isometry, then the tuple $(T_1^m,...,T_d^m)$ is a $(1,p)$-isometry. We further prove some additional properties of the operators $T_1,...,T_d$ and show a stronger result in the case of a commuting pair $(T_1,T_2)$.

10 pages (including references)