ctionalities of <code class="computeroutput"><span class="keyword">operator</span>
          <span class="special">&amp;=</span></code> are on the Map-row of the
          tables. Both functionalities fall together for Sets in the function <span class="emphasis"><em><span class="bold"><strong>set intersection</strong></span></em></span>.
        </p>
<p>
          Complexity characteristics for inplace intersection operations are given
          by the next tables where 
</p>
<pre class="programlisting"><sp