erred
        as lattices ODEs.
      </p>
<p>
        Numerical approximations for the solution <span class="emphasis"><em>x(t)</em></span> are calculated
        iteratively. The easiest algorithm is the Euler scheme, where starting at
        <span class="emphasis"><em>x(0)</em></span> one finds <span class="emphasis"><em>x(dt) = x(0) + dt f(x(0),0)</em></span>.
        Now one can use <span class="emphasis"><em>x(dt)</em></span> and obtain <span class="emphasis"><em>x(2dt)</em></span>
        in a simil