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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E1">Th5</font></span>: <a NAME="T5"><span class="comment"><font color="firebrick">:: GLIBPRE1:5</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">f</font> being   <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="funct_1.html#NM1" title="FUNCT_1:NM.1">Function</a> holds   <a href="funct_3.html#K1" title="FUNCT_3:func.1">.:</a> <font color="Olive" title="b1">f</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> <a href="funcop_1.html#K17" title="FUNCOP_1:func.17">.--&gt;</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a></div></div>
