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<b>let </b><font color="Maroon">A</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">B</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<a NAME="E1:6"/>
<span class="p1">(<span class="default"><a href="relset_1.html#K4">dom</a> <span class="p2">(<span class="default"><a href="oposet_1.html#K1" target="_self">{}</a> <font color="Maroon">A</font>,<font color="Maroon">B</font></span>)</span></span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default"><a href="relset_1.html#K5">rng</a> <span class="p2">(<span class="default"><a href="oposet_1.html#K1" target="_self">{}</a> <font color="Maroon">A</font>,<font color="Maroon">B</font></span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K5">rng</a> <span class="p1">(<span class="default"><a href="oposet_1.html#K1" target="_self">{}</a> <font color="Maroon">A</font>,<font color="Maroon">B</font></span>)</span>
 
<b>by </b><i><a class="ref" href="relat_1.html#T60">RELAT_1:60</a></i>;<br/>
<b>hence </b><a NAME="E2:6"/>
 <a href="relat_1.html#K3">field</a> <span class="p1">(<span class="default"><a href="oposet_1.html#K1" target="_self">{}</a> <font color="Maroon">A</font>,<font color="Maroon">B</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a> 
 <b>by </b><i><a class="ref" href="relat_1.html#T60">RELAT_1:60</a>, <a class="ref" href="relat_1.html#D6">RELAT_1:def 6</a></i>;<br/>


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