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On Apr 16, 2005, at 10:53 AM, Jens Axel Søgaard wrote: > Bradley Lucier wrote: > >> Well, it depends on what your goal is. ... > Here are some potential goals: > ... > 3) default-compare should define a total order on almost all Scheme > values What is "almost all"? How do a and b compare in the following? [descartes:~/programs/folding/2] lucier% gsc loading /usr/local/Gambit-C/gambcext.scm Gambit Version 4.0 beta 12 > (define a (cons #f #f)) > (set-car! a a) > (set-cdr! a a) > (define b (cons #f #f)) > (set-car! b b) > (set-cdr! b b) > (equal? a b) ;;; doesn't terminate Is default-compare compatible with equal? Brad