2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/98506Webb et al. presented preliminary evidence for a time-varying fine-structure constant. We show Teller's formula for this variation to be ruled out within the Einstein-de Sitter universe, however, it is compatible with cosmologies which require a large cosmological constant.3 pages, no figures, revtex, to be published in Mod. Phys. Lett. AAstrophysicstext