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<b>let </b><font color="Maroon">r</font> be  <a href="xreal_0.html#V1">real</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/><b>let </b><font color="Maroon">M</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="metric_1.html#L1" target="_self">MetrStruct</a> ;<br/><b>let </b><font color="Maroon">p</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font>;<br/>





<a NAME="E1:36"/>
 ex <font color="Olive">M'</font> being non <a href="struct_0.html#V3">empty</a>  <a href="metric_1.html#L1" target="_self">MetrStruct</a>  ex <font color="Olive">p'</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Olive">M'</font> st <br/>( <font color="Olive">M'</font> <a href="hidden.html#R1">=</a> <font color="Maroon">M</font> &amp; <font color="Olive">p'</font> <a href="hidden.html#R1">=</a> <font color="Maroon">p</font> &amp;  <a href="metric_1.html#K11" target="_self">Sphere</a> <font color="Maroon">p</font>,<font color="Maroon">r</font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <font color="Olive">q</font> where <font color="Olive">q</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Olive">M'</font> :  <a href="metric_1.html#K2" target="_self">dist</a> <font color="Olive">p'</font>,<font color="Olive">q</font> <a href="hidden.html#R1">=</a> <font color="Maroon">r</font> </span>}</span>  )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:36"/>
 <a href="metric_1.html#K11" target="_self">Sphere</a> <font color="Maroon">p</font>,<font color="Maroon">r</font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <font color="Olive">q</font> where <font color="Olive">q</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font> :  <a href="metric_1.html#K2" target="_self">dist</a> <font color="Maroon">p</font>,<font color="Olive">q</font> <a href="hidden.html#R1">=</a> <font color="Maroon">r</font> </span>}</span> 
 ;<br/>


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