2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146869Hartwig, Larsson and the second author in [J. Algebra, 2005] defined a bracket on sigma-derivations of a commutative algebra. We show that this bracket preserves inner derivations, and based on this obtain some structural results on sigma-derivations on Laurent polynomials in one variable.20 pagesQuantum AlgebraRings and Algebras17A36; 17B40; 17B66; 17B68; 81R12; 16W55; 16S35text