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<b>consider </b><font color="Maroon">m'</font> being   <a href="nat_1.html#NM1">Nat</a><b> such that </b><br/><a NAME="E2:10_1_1"/><i><font color="Green">E30</font></i>: 
<font color="Maroon">m</font> <a href="hidden.html#R1">=</a> <font color="Maroon">m'</font> <a href="pepin.html#K2">^2</a> 
 <b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">n'</font> being   <a href="nat_1.html#NM1">Nat</a><b> such that </b><br/><a NAME="E4:10_1_1"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">n'</font> <a href="pepin.html#K2">^2</a> 
 <b>by </b><i/>;<br/>
<a NAME="E5:10_1_1"/>
<font color="Maroon">m</font> <a href="xcmplx_0.html#K3">*</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">m'</font> <a href="xcmplx_0.html#K3">*</a> <font color="Maroon">n'</font></span>)</span> <a href="pepin.html#K2">^2</a> 
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E6:10_1_1"/>
<font color="Maroon">m</font> <a href="xcmplx_0.html#K3">*</a> <font color="Maroon">n</font> is <a href="pythtrip.html#V1" target="_self">square</a>
 ;<br/>


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