a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-sub_up"><a href="#val-sub_up" class="anchor"></a><code><span class="keyword">val</span> sub_up : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-mul_up"><a href="#val-mul_up" class="anchor"></a><code><span class="keyword">val</span> mul_up : <a href="index.html#type-t">t</a> <span>&#45;&gt;</sp