Marc: To prepare to make some changes to _num.scm, I needed to figure out what some of the basic bignum functions were, so I decided to document them (what an incredible idea!). Also, I made two small changes to abs and magnitude; now if a ratnum p/q is nonnegative then (eq? p/q (abs p/q)) => #t (eq? p/q (magnitude p/q) => #t Brad