2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/222399For a knot K in S^3 we construct according to Casson--or more precisely taking into account Lin and Heusener's further works--a volume form on the SU(2)-representation space of the group of K. We prove that this volume form is a topological knot invariant and explore some of its properties.This is the version published by Algebraic & Geometric Topology on 12 March 2006Geometric Topology57M25, 57M05, 57M27text