2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64797We show that the roots of any smooth curve of polynomials with only real roots can be parametrized twice differentiably (but not better).Amstex, 5 pages; some misprints correctedClassical Analysis and ODEs26C10Choosing roots of polynomials smoothly, IItext