2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16655We introduce a Monte Carlo method, as a modification of existing cluster algorithms, which allows simulations directly on systems of infinite size, and for quantum models also at beta=infinity. All two-point functions can be obtained, including dynamical information. When the number of iterations is increased, correlation functions at larger distances become available. Limits q -> 0 and omega -> 0 can be approached directly. As examples we calculate spectra for the d=2 Ising model and for Heisenberg quantum spin ladders with 2 and 4 legs.4 pages, 6 figures. Minor modificationsStatistical MechanicsStrongly Correlated Electronstext