2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/73422Let $(M, ω)$ be a connected compact symplectic manifold equipped with a Hamiltonian SU(2) or SO(3) action. We prove that, as fundamental group of topological spaces, $π_1(M)=π_1(M_{red})$, where $M_{red}$ is the symplectic quotient at any value of the moment map $ϕ$.This paper has been withdrawn due to some errorSymplectic GeometryAlgebraic Topology53D05, 53D20, 55Q05, 57R19text