  <ul class="toc">
      <li><a name="TOC385" href="maxima_77.html#SEC403">77.1.1 The indefinite summation problem</a></li>
      <li><a name="TOC386" href="maxima_77.html#SEC404">77.1.2 The definite summation problem</a></li>
      <li><a name="TOC387" href="maxima_77.html#SEC405">77.1.3 Verbosity levels</a></li>
    </ul></li>
    <li><a name="TOC388" href="maxima_77.html#SEC406">77.2 Functions and Variables for zeilberger</a></li>
    <li><a name="TOC389" href="maxima_77.html#SEC407">77.3 General global 