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<b>consider </b><font color="Maroon">z</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font>;<br/>
<a NAME="E2:5_1_1"/>
<font color="Maroon">z</font> <a href="metric_2.html#K1" target="_self">-neighbour</a>  is   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">M</font>
 
;<br/>
<b>hence </b><a NAME="E3:5_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being  <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">M</font> ex <font color="Olive">x</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font> st <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">x</font> <a href="metric_2.html#K1" target="_self">-neighbour</a> 
 ;<br/>


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