2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170462We give a simple unified proof for several disparate bounds on Thurston-Bennequin number for Legendrian knots and self-linking number for transverse knots in R^3, and provide a template for possible future bounds. As an application, we give sufficient conditions for some of these bounds to be sharp.15 pages, many figuresGeometric TopologySymplectic Geometry57M27; 57R17, 53D12text