es like <tt>%i1</tt> or <tt>%o5</tt>, as these will be confused with
  the lines so labeled</em>.

<div class="p"><!----></div>
Maxima distinguishes lower and upper case.  All built-in functions
have names which are lowercase only (<tt>sin</tt>, <tt>cos</tt>, <tt>save</tt>,
<tt>load</tt>, etc).  Built-in constants have lowercase names (<tt>%e</tt>,
<tt>%pi</tt>, <tt>inf</tt>, etc).  If you type <tt>SIN(x)</tt> or <tt>
  Sin(x)</tt>, Maxima assumes you mean something other than the built-in
<tt>sin</tt> func