2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/99947We calculate the measure and Hausdorff dimension of sets of matrices over fields of formal power series with good approximation properties for a restricted set of denominators.This version has a considerably more general main resultNumber Theory11J83, 11J61A metric theorem for restricted Diophantine approximation in positive characteristictext