Reports
02/12/07 Boston colloquium meeting on trends in the mathematical representation of space: Lou Crane: What does quantum gravity tell us about the nature of space time / Gonzalo Reyes: An axiomatic presentation of Einstein's vaccum field equations, from the viewpoint of synthetic differential geometry / 01/12/07: Pierre Cartier: On living in a contradictory world; categories versus sets / Shawn Westmoreland: Twin paradox without acceleration