title: Definition of a list in Scheme
body: <p>Finally taking the plunge to learn a Lisp dialect (Scheme), I have encountered two definitions of a list -</p>
  <blockquote>
  <p>&quot;Either the empty list or a pair whose cdr is a list&quot;.</p>
  <p>&quot;A collection of S-Expressions enclosed by parentheses&quot;.</p>
  </blockquote>
  <p>Are these definitions equivalent?</p>