2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56111The notion of the integral over the anticommuting Grassmann variables is applied to analyze the fermionic structure of the 2D Ising model with quenched site dilution. In the $N$-replica scheme, the model is explicitly reformulated as a theory of interacting fermions on a lattice. For weak dilution, the continuum-limit approximation implies the log-log singularity in the specific heat near $T_c$.LaTeX, 5 pages, no figures. A plenary talk at the 6th International Conference on Path Integrals from peV to TeV, August 25--29, 1998, Florence, ItalyHigh Energy Physics - TheoryStatistical MechanicsHigh Energy Physics - Latticetext