y at the points where the component smooth curves
                    $C_1, C_2, \ldots, C_n$ are joined together.

                </p>

                <figure>
                    <img src="../images/chp04/piecewise-smooth.svg" alt="Piecewise smooth curve" title="Piecewise smooth curve" style="width:65%;">
                    <figcaption>
                        A piecewise smooth curve.
                    </figcaption>
                </figure>

                <p>
                    A curve $C$ in th