The Nevanlinna–Pick norm conjecture for commutative Banach algebras

Let $A$ be a commutative Banach algebra with the Nevanlinna–Pick property represented by $A\in NP_{\infty}$. Nevanlinna–Pick norm conjecture. If $A\in NP_{\infty}$, then $A$ is a $C^{\ast}$-algebra. The paper presents this as the most general conjecture; it is known when the Gelfand space of $A$ is countable, while the general case remains open.