A classification of Prufer domains of integer-valued polynomials on algebras

Abstract

Let $D$ be an integrally closed domain with quotient field $K$ and $A$ a torsion-free $D$-algebra that is finitely generated as a $D$-module and such that $A\cap K=D$. We give a complete classification of those $D$ and $A$ for which the ring ${\text{Int}}_K(A)=\{f\in K[X]\mid f(A)\subseteq A\}$ is a Prüfer domain. If $D$ is a semiprimitive domain, then we prove that ${\text{Int}}_K(A)$ is Prüfer if and only if $A$ is commutative and isomorphic to a finite direct product of almost Dedekind domains with finite residue fields, each of them satisfying a double-boundedness condition on its ramification indices and residue field degrees.

to appear in the Bull. Lond. Math. Soc. (2026), any comment is welcome!