lso makes it possible to infer the type of a
function expression compositionally by only examining the type of its
subexpressions.</p>
</div>
<div id="constants" class="section level3 unnumbered">
<h3>Constants</h3>
<p>Constants in Stan are nothing more than nullary (no-argument)
functions. For instance, the mathematical constants <span class="math inline">\(\pi\)</span> and <span class="math inline">\(e\)</span> are
represented as nullary functions named <code>pi()</code> and <code>e()</code>.
See the <a h