  Motivated by a work of Knutson, in a recent paper Conca and Varbaro have
defined a new class of ideals, namely "Knutson ideals", starting from a
polynomial $f$ with squarefree leading term. We will show that the main
properties that this class has in polynomial rings over fields of
characteristic $p$ are preserved when one introduces the definition of Knutson
ideal also in polynomial rings over fields of characteristic zero. Then we will
show that determinantal ideals of Hankel matrices are Knutson ideals for a
suitable choice of the polynomial $f$.
