2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103800We study the family of ideals defined by mixed size minors of two-sided ladders of indeterminates. We compute their Groebner bases with respect to a skew-diagonal monomial order, then we use them to compute the height of the ideals. We show that these ideals correspond to a family of irreducible projective varieties, that we call mixed ladder determinantal varieties. We show that these varieties are arithmetically Cohen-Macaulay. We characterize the arithmetically Gorenstein ones, among those that satisfy a technical condition. Our main result consists in proving that mixed ladder determinantal varieties belong to the same G-biliaison class of a linear variety.15 pages, contains an improved version of Theorem 1.25 (now 1.23)Commutative AlgebraAlgebraic Geometry14M06, 13C40, 14M12text