2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/115752An indicator for presence of community structure in networks is suggested. It allows one to check whether such structures can exist, in principle, in any particular network, without a need to apply computationally cost algorithms. In this way we exclude a large class of networks that do not possess any community structure.8 pages, 5 figuresPhysics and SocietyDisordered Systems and Neural Networkstext