/a></code></dt><dt class="spec value" id="val-top"><a href="#val-top" class="anchor"></a><code><span class="keyword">val</span> top : <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-not"><a href="#val-not" class="anchor"></a><code><span class="keyword">val</span> not : <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-implies"><a href="#val-implies" class="anchor"></a><code><span class="keyword">va