2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/75709Dumont has conjectured a marvellous identity, which generalizes, in particular, the classical results of Lagrange, Gauss, Jacobi and Kronecker on the sums of two, three and four squares. We give a combinatorial proof of Dumont's conjecture.6 pagesNumber TheoryCombinatorics11E25, 11D45, 11E20, 05A05text