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<b>let </b><font color="Maroon">c1</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>, <font color="Maroon">c2</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:36_1_1"/><i><font color="Green">E37</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">c1</font> <a href="lattices.html#K1" target="_self">"\/"</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">c1</font> &amp; <font color="Olive">a</font> <a href="lattices.html#K1" target="_self">"\/"</a> <font color="Maroon">c1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">c1</font> )
 <b>and </b><br/><a NAME="E2:36_1_1"/><i><font color="Green">E39</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">c2</font> <a href="lattices.html#K1" target="_self">"\/"</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">c2</font> &amp; <font color="Olive">a</font> <a href="lattices.html#K1" target="_self">"\/"</a> <font color="Maroon">c2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">c2</font> )
 ;<br/>

<b>thus </b><font color="Maroon">c1</font> = 
<font color="Maroon">c2</font> <a href="lattices.html#K1" target="_self">"\/"</a> <font color="Maroon">c1</font>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">c2</font>
<b>by </b><i><a class="ref" href="lattices.html#D4" target="_self">Def4</a></i>
;<br/>


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