2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27335Simple and quite general considerations are used to show that the results of d.c. transport experiments on macroscopic Hall bars are inconsistent with Hartree models in which a majority of the branches of single-particle composite fermion edge states at the Fermi level propagate in the direction opposite to that in which non-interacting electrons travel along the edge.4 pages + 1 figure. Self-unpacking uuencoded postscript. Unpacking instructions at beginning of fileCondensed Mattertext