Billiards night was one of the first events that Christina and I plan for Math Club. It was a relatively simple event, focused on bringing together people For a night of pool and pizza. We played videos about billiards, including ones that went over the geometry of planning different types of shots on televisions in the background of the pool hall. We held this event several times over the years.
Group-level events, like fission and extinction, catalyze the evolution of cooperation in group-structured populations by creating new paths from uncooperative population states to more cooperative states. Group-level events allow cooperation to …