2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100426In a recent letter Machida et al. [Phys. Rev. Lett. 93, 200402 (2004)] concluded that in a trapped gas of fermions with repulsive interactions a superfluid phase appears around the Mott-insulator at the center of the trap. They base their conclusion on a negative binding energy, and a large weight for a singlet formed by particles located at opposite sides of the Mott-insulator. We show here that the observed effects are not related to superfluidity.Revtex file, 1 page, 1 figure, published versionStrongly Correlated ElectronsSuperconductivitytext