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

<b>let </b><font color="Maroon">g</font> be   <a href="funct_1.html#NM1">Function</a>;<br/><b>let </b><font color="Maroon">f</font> be   <a href="funct_1.html#NM1">Function</a>;<br/><b>let </b><font color="Maroon">f'</font> be   <a href="funct_1.html#NM1">Function</a>, <font color="Maroon">g'</font> be   <a href="funct_1.html#NM1">Function</a>;<br/>





<b>assume </b><a NAME="E1:62"/>
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">f'</font> <a href="xboole_0.html#R1">misses</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">g</font></span>)</span> <a href="subset_1.html#K6">\</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">g'</font></span>)</span>
 ;<br/>

<a NAME="E2:62"/><b>then </b>
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">g</font> <a href="xboole_0.html#R1">misses</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">f'</font></span>)</span> <a href="subset_1.html#K6">\</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">g'</font></span>)</span>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T81">XBOOLE_1:81</a></i>;<br/>
<b>hence </b><a NAME="E3:62"/>
(  not <font color="Maroon">f'</font> <a href="hidden.html#R2">in</a>  <a href="ami_1.html#K7" target="_self">sproduct</a> <font color="Maroon">f</font> or  not <font color="Maroon">g'</font> <a href="hidden.html#R2">in</a>  <a href="ami_1.html#K7" target="_self">sproduct</a> <font color="Maroon">g</font> or <font color="Maroon">f'</font> <a href="funct_4.html#K1">+*</a> <font color="Maroon">g'</font> <a href="hidden.html#R2">in</a>  <a href="ami_1.html#K7" target="_self">sproduct</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="funct_4.html#K1">+*</a> <font color="Maroon">g</font></span>)</span> )
 <b>by </b><i/>;<br/>


</div>
