/p>

    <p>
      This mesh uses 81 nodes and forms 32 quadratic triangular elements.
    </p>

    <p>
      We assume that the equation to be solved is
      <blockquote><b>
        dUdT - Laplacian U + K * U = F
      </b></blockquote>
      with
      <blockquote><b>
        K = 0,
      </b></blockquote>
      and
      <blockquote><b>
        F = (2*pi*pi-1)*sin(pi*x)*sin(pi*y)*exp(-t).
      </b></blockquote>
      The exact solution is:
      <blockquote><b>
        U = sin(pi*x) * sin(pi*y) * exp(