This article is a collection of letters solicited by the editors of the Bulletin in response to a previous article by Jaffe and Quinn [math.HO/9307227]. The authors discuss the role of rigor in mathematics and the relation between mathematics and theoretical physics.
We expected a fair number of participants to drop out as the course progressed. Indeed, we had raised the numbers to 48 anticipating this. In fact the average level of attendance was 46.3 out of 48, and all of the children were present at the first and last session.