2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150146This paper, yet another account of Seiberg-Witten theory and its consequences for algebraic surfaces, is the written version of the author's talk at the Santa Cruz conference.AMS-TeX, amsppt styleAlgebraic Geometry14J15, 57R55 (Primary) 32J27, 57N13 (Secondary)text