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<b>let </b><font color="Maroon">R</font> be    <a href="struct_0.html#L1">1-sorted</a> ;<br/>

<a NAME="E1:4"/>
( the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">R</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  implies the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">R</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  )
 
;<br/>
<a NAME="E2:4"/><b>then </b>
(  <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><a href="grcat_1.html#K7">id</a> <font color="Maroon">R</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">R</font> &amp;  <a href="relset_1.html#K5">rng</a> <span class="p1">(<span class="default"><a href="grcat_1.html#K7">id</a> <font color="Maroon">R</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">R</font> )
 
<b>by </b><i>, <a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<b>hence </b><span class="p1">(<span class="default"><a href="grcat_1.html#K7">id</a> <font color="Maroon">R</font></span>)</span> <a href="tops_2.html#K2">/"</a>  = 
<span class="p1">(<span class="default"><a href="partfun1.html#K6">id</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">R</font></span>)</span> <a href="funct_2.html#K2">"</a> 
<b>by </b><i><a class="ref" href="tops_2.html#D4">TOPS_2:def 4</a></i>
<br/>.= 
 <a href="grcat_1.html#K7">id</a> <font color="Maroon">R</font>
<b>by </b><i><a class="ref" href="funct_1.html#T67">FUNCT_1:67</a></i>
;<br/><br/>


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