2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106240In this paper we present several counterexamples to Rasmussen's conjecture that the concordance invariant coming from Khovanov homology is equal to twice the invariant coming from Ozsv{á}th-Szab{ó} Floer homology. The counterexamples are twisted Whitehead doubles of the (2,2n+1) torus knots.13 pages, 2 large color figures, 1 small black/white figureGeometric TopologySymplectic Geometry57M27, 57R58text