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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E7">Th12</font></span>: <a NAME="T12"><span class="comment"><font color="firebrick">:: SYSREL:12</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">X</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds  <span class="p1">(<span class="default"><a href="relat_1.html#K4" title="RELAT_1:func.4">id</a> <font color="Olive" title="b1">X</font></span>)</span> <a href="relat_1.html#NK6" title="RELAT_1:NK.6">*</a> <span class="p1">(<span class="default"><a href="relat_1.html#K4" title="RELAT_1:func.4">id</a> <font color="Olive" title="b1">X</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="relat_1.html#K4" title="RELAT_1:func.4">id</a> <font color="Olive" title="b1">X</font></div></div>
