egative" class="anchor"></a><code><span class="keyword">val</span> is_negative : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> bool</code></dt><dt class="spec value" id="val-is_singleton"><a href="#val-is_singleton" class="anchor"></a><code><span class="keyword">val</span> is_singleton : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> bool</code></dt><dt class="spec value" id="val-neg"><a href="#val-neg" class="anchor"></a><code><span class="keyword">val</span> neg : <a href="index.html#