      Is the range empty?
       </p>
       <p>
        <code class="literal">isempty(numrange(1.1,2.2))</code>
        → <code class="returnvalue">f</code>
       </p></td></tr><tr><td class="func_table_entry"><p class="func_signature">
        <a id="id-1.5.8.26.10.2.2.4.1.1.1" class="indexterm"></a>
        <code class="function">lower_inc</code> ( <code class="type">anyrange</code> )
        → <code class="returnvalue">boolean</code>
       </p>
       <p>
        Is the range's lower bound inclusi