On Sat, 2010-01-30 at 17:41 -0500, joe tex wrote: > I am a scheme newbie currently reading "The Little Schemer" > The book provides the function for atom as follows. > > ------- atom.scm---------------- > (define atom? > (lambda (x) > (and (not (pair? x)) (not null? x)))) It should be (not (null? x)) Brad