ml" title="Symplectic System">Symplectic
              System</a>, <a class="link" href="simple_symplectic_system.html" title="Simple Symplectic System">Simple
              Symplectic System</a> or <a class="link" href="implicit_system.html" title="Implicit System">Implicit
              System</a>.
            </p></dd>
</dl>
</div>
<h5>
<a name="boost_numeric_odeint.concepts.controlled_stepper.h3"></a>
        <span class="phrase"><a name="boost_numeric_odeint.concepts.controlled_stepper.valid_expression