2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27311We study the roughness of randomly crumpled elastic sheets. Based on analytical and numerical calculations, we find that they are self affine with a roughness exponent equal to one. Such crumpling occurs {\it e.g.\/} when wet paper dries. We also discuss the case of correlated crumpling, which occurs in connection with flattening of randomly folded paper.REVTeX (17 pages), 7 postscript figures, tarred, gzipped, uuencoded using `uufiles', coming with a separate fileCondensed MatterMaterials Sciencetext