Integer-valued Polynomials, Pr\"ufer Domains and the Sacked Bases Property

To study the question of whether every two-dimensional Pr"ufer domain possesses the stacked bases property, we consider the particular case of the Pr"ufer domains formed by integer-valued polynomials. The description of the spectrum of the rings of integer-valued polynomials on a subset of a rank-one valuation domain enables us to prove that they all possess the stacked bases property. We also consider integer-valued polynomials on rings of integers of number fields and we reduce in this case the study of the stacked bases property to questions concerning $2\times 2$-matrices.