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<b>let </b><font color="Maroon">x</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="robbins1.html#K8" target="_self">CLatt</a> <font color="Maroon">L</font></span>)</span>, <font color="Maroon">y</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="robbins1.html#K8" target="_self">CLatt</a> <font color="Maroon">L</font></span>)</span>; <i><font color="Red">:: according to </font></i><a class="ref" href="robbins1.html#D6" target="_self">ROBBINS1:def 6</a><br/>

<b>reconsider </b><font color="Maroon">x'</font> = <font color="Maroon">x</font>, <font color="Maroon">y'</font> = <font color="Maroon">y</font> as   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> <b>by </b><i><a class="ref" href="robbins1.html#T7" target="_self">Th7</a></i>;<br/>
<a NAME="E2:68_1_1"/><i><font color="Green">E27</font></i>: 
( <font color="Maroon">x</font> <a href="robbins1.html#K3" target="_self">`</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">x'</font> <a href="robbins1.html#K3" target="_self">`</a>  &amp; <font color="Maroon">y</font> <a href="robbins1.html#K3" target="_self">`</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">y'</font> <a href="robbins1.html#K3" target="_self">`</a>  )
 
<b>by </b><i><a class="ref" href="robbins1.html#T8" target="_self">Th8</a></i>;<br/>
<a NAME="E3:68_1_1"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <span class="p1">(<span class="default"><font color="Maroon">y</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">x'</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <span class="p1">(<span class="default"><font color="Maroon">y'</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="robbins1.html#T8" target="_self">Th8</a></i>;<br/>
<a NAME="E4:68_1_1"/><b>then </b><i><font color="Green">E35</font></i>: 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">x</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <span class="p2">(<span class="default"><font color="Maroon">y</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span></span>)</span> <a href="robbins1.html#K3" target="_self">`</a>  <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">x'</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <span class="p2">(<span class="default"><font color="Maroon">y'</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span></span>)</span> <a href="robbins1.html#K3" target="_self">`</a> 
 
<b>by </b><i><a class="ref" href="robbins1.html#T8" target="_self">Th8</a></i>;<br/>
<a NAME="E5:68_1_1"/>
<span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <font color="Maroon">y</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">x'</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <font color="Maroon">y'</font>
 
<b>by </b><i><a class="ref" href="robbins1.html#D9" target="_self">Def9</a>, <a class="ref" href="robbins1.html#T8" target="_self">Th8</a></i>;<br/>
<a NAME="E6:68_1_1"/><b>then </b>
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">x</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <font color="Maroon">y</font></span>)</span> <a href="robbins1.html#K3" target="_self">`</a>  <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">x'</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <font color="Maroon">y'</font></span>)</span> <a href="robbins1.html#K3" target="_self">`</a> 
 
<b>by </b><i><a class="ref" href="robbins1.html#T8" target="_self">Th8</a></i>;<br/>
<b>hence </b><span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">x</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <span class="p3">(<span class="default"><font color="Maroon">y</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span></span>)</span> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">x</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <font color="Maroon">y</font></span>)</span> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">x'</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <span class="p3">(<span class="default"><font color="Maroon">y'</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span></span>)</span> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">x'</font> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span> <a href="robbins1.html#NK4" target="_self">+</a> <font color="Maroon">y'</font></span>)</span> <a href="robbins1.html#K3" target="_self">`</a> </span>)</span>
<b>by </b><i>, <a class="ref" href="robbins1.html#T8" target="_self">Th8</a></i>
<br/>.= 
<font color="Maroon">x</font>
<b>by </b><i/>
;<br/><br/>


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