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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E33">Th56</font></span>: <a NAME="T57"><span class="comment"><font color="firebrick">:: FUNCT_7:57</font></span><br/></a><div class="add">(  <a href="funct_7.html#K5" title="FUNCT_7:func.5">firstdom</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  &amp;  <a href="funct_7.html#K6" title="FUNCT_7:func.6">lastrng</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  ) <span class="kw">by</span> <span class="lab"><a class="ref" href="funct_7.html#D6" target="_self" onmouseover="rs('funct_7/D6')" onmouseout="rh()">Def5</a>, <a class="ref" href="funct_7.html#D7" target="_self" onmouseover="rs('funct_7/D7')" onmouseout="rh()">Def6</a></span>;<br/></div></div>
