2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57741Lecture notes given at the summer school ``Applications of random matrices to physics", Les Houches, June 2004.60 pages, 17 figures, uses harvmac and epsf macros, nasty problem with figbox solvedMathematical PhysicsStatistical MechanicsHigh Energy Physics - TheoryCombinatorics2D Quantum Gravity, Matrix Models and Graph Combinatoricstext