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<b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">p1</font> be   <a href="pre_topc.html#NM2">Point</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15">TOP-REAL</a> <font color="Maroon">n</font></span>)</span>;<br/><b>let </b><font color="Maroon">p2</font> be   <a href="pre_topc.html#NM2">Point</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15">TOP-REAL</a> <font color="Maroon">n</font></span>)</span>;<br/>





<span class="p1"><a href="euclid_2.html#K2" target="_self">|(</a><span class="default"><span class="p2">(<span class="default"><a href="euclid.html#K19">-</a> <font color="Maroon">p1</font></span>)</span>,<font color="Maroon">p2</font></span><a href="euclid_2.html#K2" target="_self">)|</a></span> = 
<span class="p1"><a href="euclid_2.html#K2" target="_self">|(</a><span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="xcmplx_0.html#K4">-</a> 1</span>)</span> <a href="euclid.html#K18">*</a> <font color="Maroon">p1</font></span>)</span>,<font color="Maroon">p2</font></span><a href="euclid_2.html#K2" target="_self">)|</a></span>
<b>by </b><i><a class="ref" href="euclid.html#T43">EUCLID:43</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="xcmplx_0.html#K4">-</a> 1</span>)</span> <a href="xcmplx_0.html#K3">*</a> <span class="p1"><a href="euclid_2.html#K2" target="_self">|(</a><span class="default"><font color="Maroon">p1</font>,<font color="Maroon">p2</font></span><a href="euclid_2.html#K2" target="_self">)|</a></span>
<b>by </b><i/>
;<br/>
<b>hence </b><a NAME="E2:40"/>
<span class="p1"><a href="euclid_2.html#K2" target="_self">|(</a><span class="default"><span class="p2">(<span class="default"><a href="euclid.html#K19">-</a> <font color="Maroon">p1</font></span>)</span>,<font color="Maroon">p2</font></span><a href="euclid_2.html#K2" target="_self">)|</a></span> <a href="hidden.html#R1">=</a>  <a href="xcmplx_0.html#K4">-</a> <span class="p1"><a href="euclid_2.html#K2" target="_self">|(</a><span class="default"><font color="Maroon">p1</font>,<font color="Maroon">p2</font></span><a href="euclid_2.html#K2" target="_self">)|</a></span>
 ;<br/>


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