2 Commits

Author	SHA1	Message	Date
Matthias Felleisen	c15885ca6c	fixed weak contract for real numbers; no need to propagate ... svn: r16102	2009-09-21 14:11:43 +00:00
Matthias Felleisen	f5714c2086	added universe via a 2htdp teachpack ... svn: r12980	2009-01-03 02:38:09 +00:00