2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54877The study of the convergence of power series expansions of energy eigenvalues for anharmonic oscillators in quantum mechanics differs from general understanding, in the case of quasi-exactly solvable potentials. They provide examples of expansions with finite radius and suggest techniques useful to analyze more generic potentials.11 pages, Latex (1 EPS figure included)High Energy Physics - Theorytext