2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147544A simple but accurate mesh current analysis is performed on a XY model and on a SIMF model to derive the equations for a Josephson junction array. The equations obtained here turn out to be different from other equations already existing in the literature. Moreover, it is shown that the two models come from an unique hidden structure18 LaTex pages, one figure in .ps format, epsf.tex included. Tar'ed, zipped, uuencoded. Revised version: a widespread sign error corrected, comments addedCondensed Mattertext