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<b>consider </b><font color="Maroon">c</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E2:30_1_1"/><i><font color="Green">E27</font></i>: 
for <font color="Olive">a</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> holds <br/> ( <font color="Maroon">c</font> <a href="robbins1.html#K6" target="_self">*'</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">c</font> &amp; <span class="p1">(<span class="default"><font color="Olive">a</font> <a href="robbins1.html#K5" target="_self">+</a> <span class="p2">(<span class="default"><font color="Olive">a</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> <font color="Maroon">c</font> )
 <b>by </b><i/>;<br/>
<b>thus </b><a NAME="E3:30_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> st <br/>for <font color="Olive">a</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> holds  <font color="Olive">b<sub>1</sub></font> <a href="robbins1.html#K6" target="_self">*'</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>1</sub></font>
 <b>by </b><i/>;<br/>


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