2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/124291We give a combinatorial interpretation of a certain positivity conjecture of Chern-Schwartz-MacPherson classes, as stated by P. Aluffi and the author in a previous paper. It translates into a positivity property for a sum of p by p determinants consisting of binomial coefficients, generalizing the classical Theorem of Lindstrom-Gessel-Viennot et al. which computes these determinants in terms of non-intersecting lattice paths. We prove this conjecture for p=2,3.10 pages, 5 figures, comments are welcomeCombinatoricsAlgebraic Geometrytext