2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/66471We observe that a sharp result on the exponential growth rate of the number of primitive elements exists for the free group on two generators.Group TheoryGeometric Topology20E05A Remark on "Counting primitive elements in free groups" (by J. Burillo and E. Ventura)text