2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/86282The evolution equation for $q \bar q$ production introduced by Marchesini and Mueller posed some intriguing mathematical puzzles, both numerical and analytic. I give a detailed account of the numerical approach which led eventually to the exact solution. While part of the work was in fact along a wrong track, it turns out that some of the techniques involved are interesting in their own and applicable to many other problems, i.e. to the numerical study of Ricci flows.14 pages, 6 fig.s, 16 ref.sComputational Physicstext