h1>
                    <p>A stream graph is a quadruplet <img class="math"
                                                           src="../_images/math/f55df6d60d95e9f0037cb383e660df030c917c63.png"
                                                           alt="S = (T,V,W,E)"/> where <img class="math"
                                                                                            src="../_images/math/e4762cec46619bf7781cae62216214f909395368.png"
                                              