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<b>let </b><font color="Maroon" title="c1">X</font>, <font color="Maroon" title="c2">Q</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>let </b><font color="Maroon" title="c3">f</font> be   <a href="partfun1.html#NM1" title="PARTFUN1:NM.1">PartFunc</a> of <font color="Maroon" title="c1">X</font>, <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> ;<br/>





<a NAME="E1:42"/>
<font color="Maroon" title="c3">f</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
 
<b>by </b><i><a class="ref" href="partfun1.html#T64" target="_self" title="PARTFUN1:th.64">Th64</a></i>;<br/>
<b>hence </b><a NAME="E2:42"/>
<font color="Maroon" title="c3">f</font> <a href="relat_1.html#K10" title="RELAT_1:func.10">"</a> <font color="Maroon" title="c2">Q</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
 <b>by </b><i><a class="ref" href="relat_1.html#T172" title="RELAT_1:th.172">RELAT_1:172</a></i>;<br/>


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