2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95604The existence and continuity for the Calderon projector of the perturbed odd signature operator on a 3-manifold is established. As an application we give a new proof of a result of Taubes relating the mod 2 spectral flow of a family of operators on a homology 3-sphere with the difference in local intersection numbers of the character varieties coming from a Heegard decomposition.Typo in title fixedGeometric TopologyDifferential Geometry57M27, 58J32Calderon projector for the Hessian of the perturbed Chern-Simons function on a 3-manifold with boundarytext