Calcular Algebras

Jim Agler, John E. McCarthy, Nicholas J. Young

A calcular algebra is a subalgebra of $H^{\infty }(\Omega )$ with norm given by $\Vert \varphi \Vert =\sup \Vert \varphi (T)\Vert$ as $T$ ranges over a given class of commutative $d$-tuples of operators with Taylo…