2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64183We study the behavior of Legendrian and transverse knots under the operation of connected sums. As a consequence we show that there exist Legendrian knots that are not distinguished by any known invariant. Moreover, we classify Legendrian knots in some non-Legendrian simple knot types.13 pages, 5 figuresSymplectic GeometryGeometric Topology53C15text