2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/123275We introduce and solve a two-matrix model for the tri-coloring problem of the vertices of a random triangulation. We present three different solutions: (i) by orthogonal polynomial techniques (ii) by use of a discrete Hirota bilinear equation (iii) by direct expansion. The model is found to lie in the universality class of pure two-dimensional quantum gravity, despite the non-polynomiality of its potential.50 pages, 4 figures, Tex, uses harvmac, epsfCondensed MatterHigh Energy Physics - TheoryQuantum Algebratext