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<div><span class="kw">theorem </span><a NAME="T20"><span class="comment"><font color="firebrick">:: FUNCT_4:20</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">f</font> being   <a href="funct_1.html#NM1" title="FUNCT_1:NM.1">Function</a> holds  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> <a href="funct_4.html#K1" title="FUNCT_4:func.1">+*</a> <font color="Olive" title="b1">f</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">f</font> ;<br/></div></div>
