2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103589In this paper we formulate three problems concerning topological properties of sets generating Borel non-sigma-compact groups. In case of the concrete F_σδ-subgroup of the Cantor group this gives an equivalent reformulation of the Scheepers diagram problem.6 pages; Latex2e; Submitted to Matematychni StudiiGeneral Topology22-99, 54D20, 28A05text