The pages linked to below contain raw and unpolished notes for lectures, links to source materials, cuts-and-pastes from old lectures, websites, etc. They are not intended to be taken as finished products, fully vetted, nicely edited, or ready for prime time. They are made available here as raw material for others. Every effort is made to fully cite materials not created by me. All other materials here authored by Dan Ryan are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.