<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">M</font> be   <a href="midsp_1.html#NM1">MidSp</a>;<br/><b>let </b><font color="Maroon">a</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font>;<br/><b>let </b><font color="Maroon">b</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font>;<br/><b>let </b><font color="Maroon">c</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font>;<br/><b>let </b><font color="Maroon">d</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font>;<br/><b>let </b><font color="Maroon">d'</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">M</font>;<br/>











<b>assume </b><a NAME="E1:23"/><i><font color="Green">E37</font></i>: 
<font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="midsp_1.html#R1" target="_self">@@</a> <font color="Maroon">c</font>,<font color="Maroon">d</font>
 ;<br/>

<b>assume </b><a NAME="E2:23"/><i><font color="Green">E38</font></i>: 
<font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="midsp_1.html#R1" target="_self">@@</a> <font color="Maroon">c</font>,<font color="Maroon">d'</font>
 ;<br/>

<font color="Maroon">a</font> <a href="midsp_1.html#K4" target="_self">@</a> <font color="Maroon">d</font> = 
<font color="Maroon">b</font> <a href="midsp_1.html#K4" target="_self">@</a> <font color="Maroon">c</font>
<b>by </b><i>, </i>
<br/>.= 
<font color="Maroon">a</font> <a href="midsp_1.html#K4" target="_self">@</a> <font color="Maroon">d'</font>
<b>by </b><i>, </i>
;<br/>
<b>hence </b><a NAME="E4:23"/>
<font color="Maroon">d</font> <a href="hidden.html#R1">=</a> <font color="Maroon">d'</font>
 <b>by </b><i/>;<br/>


</div>
