2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149277These lectures deal with: (1) a brief review of the theory of flexible random manifolds (with fixed intrinsic metric), connected to the physics of polymerized membranes, and of the effect of extrinsic curvature (crumpling transitions); (2) a discussion of the effect of self-avoidance and its renormalization group treatment in term of a non-local field theory (this last part is not much different from cond-mat/9509096).Lectures given at the Cargese Summer School "Low Dimensional Applications of Quantum Field Theory", 11 - 31 July 1995, 17 pages, LaTeX + epsf.sty, 13 figures (only LaTeX format changed to fit with the Archive PostScript generator)High Energy Physics - Theorytext