2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61759In this note, we answer in negative a question posed by McGibbon about the generic property of H-space structure. In fact we verify the conjecture of Roitberg. Incidentally, the same example also answers in negative the open problem 10 in McGibbon.Algebraic Topology55P60,55P45text