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<div class="add">

<b>let </b><font color="Maroon">M</font> be   <a href="sub_metr.html#NM1">PseudoMetricSpace</a>;<br/><b>let </b><font color="Maroon">VQ</font> be    <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>;<br/>



<a NAME="E1:43"/><i><font color="Green">E28</font></i>: 
( <font color="Maroon">VQ</font> <a href="hidden.html#R2">in</a>  <a href="metric_2.html#K8" target="_self">elem_in_rel</a> <font color="Maroon">M</font> implies  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">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> ) )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="43_1"><b>proof </b></a><div class="add">

<b>assume </b><a NAME="E1:43_1"/>
<font color="Maroon">VQ</font> <a href="hidden.html#R2">in</a>  <a href="metric_2.html#K8" target="_self">elem_in_rel</a> <font color="Maroon">M</font>
 ;<br/>

<a NAME="E2:43_1"/><b>then </b>
<font color="Maroon">VQ</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">S</font> where <font color="Olive">S</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">S</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> 
 
;<br/>
<a NAME="E3:43_1"/><b>then </b>
 ex <font color="Olive">S</font> being   <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> st <br/>( <font color="Maroon">VQ</font> <a href="hidden.html#R1">=</a> <font color="Olive">S</font> &amp;  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">S</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/>
<b>hence </b><a NAME="E4:43_1"/>
 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">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> )
 ;<br/>


</div><b>end;</b></div>
<b>thus </b><a NAME="E2:43"/>
( <font color="Maroon">VQ</font> <a href="hidden.html#R2">in</a>  <a href="metric_2.html#K8" target="_self">elem_in_rel</a> <font color="Maroon">M</font> iff  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">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> ) )
 <b>by </b><i><a class="ref" href="metric_2.html#D1" target="_self">Def1</a></i>;<br/>


</div>
