2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67158We present two different constructions of invariants for Legendrian knots in the standard contact space $\R^3$. These invariants are defined combinatorially, in terms of certain planar projections, and are useful in distinguishing Legendrian knots that have the same classical invariants but are not Legendrian isotopic.Geometric Topology57R17text