2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/75157This paper concerns a formula which relates the Lefschetz number L(f) for a map f:M --> M' to the fixed point index I(f) summed with the fixed point index of a derived map on part of the boundary of M. Here M is a compact manifold and M' is M with a collar attached.Accepted for publication in Fixed Point Theory and Applications as part of the proceedings of the Newfoundland conference on fixed points, 2004Geometric TopologyAlgebraic Topologytext