 class="emphasis"><em>x</em></span>.</p>
          </li>
<li class="listitem">
            <p><span class="bold"><strong>deriv_type</strong></span></p>
<p><code class="computeroutput"><span class="identifier">Stepper</span><span class="special">::</span><span class="identifier">deriv_type</span></code></p>
<p>The
            type characterizing the derivative of the ODE, hence <span class="emphasis"><em>d x/dt</em></span>.</p>
          </li>
<li class="listitem">
            <p><span class="bold"><strong>t