2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61041In this article, we consider the maximal value of the Thurston--Bennequin invariant of Legendrian knots which topologically represent a fixed knot type in the standard contact 3-space and we prove a formula of the value under the connected sum operation of knots.7 pages and 6 figuresGeometric Topology57R17, 57M25text