2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185496The dimensional reduction of the three-dimensional fermion-Chern-Simons model (related to Hopf maps) of Adam et el. is shown to be equivalent to (i) either the static, fixed--chirality sector of our non-relativistic spinor-Chern-Simons model in 2+1 dimensions, (ii) or a particular Heisenberg ferromagnet in the plane.4 pages, Plain Tex, no figuresHigh Energy Physics - TheoryMathematical Physicstext