2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60479We establish tools to facilitate the computation and application of the Chekanov-Eliashberg differential graded algebra (DGA), a Legendrian-isotopy invariant of Legendrian knots in standard contact three-space. More specifically, we reformulate the DGA in terms of front projection, and introduce the characteristic algebra, a new invariant derived from the DGA. We use our techniques to distinguish between several previously indistinguishable Legendrian knots and links.24 pages, 13 figures; more examples, section on links added; minor revisions madeGeometric Topology57R17 (primary) 53D12, 57M27 (secondary)text