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<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>] <b>means </b> ex <font color="Olive">V</font>, <font color="Olive">Q</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a>  ex <font color="Olive">v</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a>  st <br/>( <font color="Maroon">a<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">V</font>,<font color="Olive">Q</font></span><a href="domain_1.html#K1">]</a></span> &amp; <font color="Olive">V</font>,<font color="Olive">Q</font> <a href="metric_2.html#R4" target="_self">is_dst</a> <font color="Olive">v</font> );<br/>
<a NAME="E1:42_1_1"/>
<span class="p1">{<span class="default"> <font color="Olive">VQ</font> where <font color="Olive">VQ</font> is    <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span> : <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">VQ</font>] </span>}</span>  <a href="tarski.html#R1">c=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>
 
<b>from </b><i><a class="ref" href="fraenkel.html#S10">FRAENKEL:sch 10</a>();<br/></i>
<b>hence </b><a NAME="E2:42_1_1"/>
<span class="p1">{<span class="default"> <font color="Olive">VQ</font> where <font color="Olive">VQ</font> is    <a href="subset_1.html#M1">Element</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span> :  ex <font color="Olive">V</font>, <font color="Olive">Q</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a>  ex <font color="Olive">v</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a>  st <br/>( <font color="Olive">VQ</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">V</font>,<font color="Olive">Q</font></span><a href="domain_1.html#K1">]</a></span> &amp; <font color="Olive">V</font>,<font color="Olive">Q</font> <a href="metric_2.html#R4" target="_self">is_dst</a> <font color="Olive">v</font> ) </span>}</span>  is   <a href="subset_1.html#NM2">Subset</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">M</font> <a href="metric_2.html#K2" target="_self">-neighbour</a> </span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>
 ;<br/>


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