2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/109024We expose the most advanced equiconvergence results for Birkhoff- and Stone-regular differential operators and present also author's approach to this problem. We give a full proof of equiconvergence on the whole interval, which constitutes a true generalization of the Tamarkin-Stone theorem.71 pages, no figures, latex2e. Chapters 1,2 of my survey, handwritten chapters 3,4 excludedSpectral Theory34L10, 47E05 (Primary) 47F05 (Secondary)text