on></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.43056em;vertical-align:0em;"></span><span class="mord mathnormal">x</span></span></span></span> as a history of values (and these don’t change).</li>
<li>With time measured in discrete steps, we can model a time function as a sequence of values.</li>
<li>Stream processing allows us to model state without assignments.</li>
</ul>
<h2 id="3.5.1" class="anchor">
<a class="anchor__lin