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<div><span class="kw">theorem </span><a NAME="T20"><span class="comment"><font color="firebrick">:: PARTIT_2:20</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">A</font>, <font color="Olive" title="b2">B</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds   <a href="relat_1.html#K1" title="RELAT_1:func.1">field</a> <span class="p1">(<span class="default"><a href="partit_2.html#K1" title="PARTIT_2:func.1">{}</a> (<font color="Olive" title="b1">A</font>,<font color="Olive" title="b2">B</font>)</span>)</span> <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="relat_1.html#T40" onmouseover="rs('relat_1/T40')" onmouseout="rh()">RELAT_1:40</a></span>;<br/></div></div>
