2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/123297We study the statistics of semi-meanders, i.e. configurations of a set of roads crossing a river through n bridges, and possibly winding around its source, as a toy model for compact folding of polymers. By analyzing the results of a direct enumeration up to n=29, we perform on the one hand a large n extrapolation and on the other hand we reformulate the available data into a large q expansion, where q is a weight attached to each road. We predict a transition at q=2 between a low-q regime with irrelevant winding, and a large-q regime with relevant winding.uses harvmac (l), epsf, 16 figs included, uuencoded, tar compressedHigh Energy Physics - Theorytext