2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/162365We find all polynomials f,g,h over a field K such that g and h are linear and f(g(x))=h(f(x)). We also solve the same problem for rational functions f,g,h, in case the field K is algebraically closed.8 pagesNumber TheoryDynamical Systems39B12; 12E05text