2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27079The length dependence is computed of the resistance of a disordered normal-metal wire attached to a superconductor. The scaling of the transmission eigenvalue distribution with length is obtained exactly in the metallic limit, by a transformation onto the isobaric flow of a two-dimensional ideal fluid. The resistance has a minimum for lengths near l/Gamma, with l the mean free path and Gamma the transmittance of the superconductor interface.8 pages, REVTeX-3.0, 3 postscript figures appended as self-extracting archive, INLO-PUB-940315Condensed Mattertext