2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/158357These are (heavily revised) notes from lectures given at the AMS Algebraic Geometry meeting in Seattle, 2005. The main topic is symplectic homology seen from the point of view of Lefschetz fibrations. Most of the content is speculative, but some supporting evidence is included.Symplectic GeometryK-Theory and Homologytext