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<b>let </b><font color="Maroon">f</font> be   <a href="funct_1.html#NM1">Function</a>;<br/><b>let </b><font color="Maroon">x1</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">x2</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">y1</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">y2</font> be    <a href="hidden.html#M1">set</a> ;<br/>



<b>assume </b><a NAME="E1:64"/>
( <font color="Maroon">x1</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font> &amp; <font color="Maroon">y1</font> <a href="hidden.html#R2">in</a> <font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">x1</font> )
 ;<br/>

<a NAME="E2:64"/><b>then </b><i><font color="Green">E28</font></i>: 
<font color="Maroon">x1</font> <a href="cqc_lang.html#K3">.--&gt;</a> <font color="Maroon">y1</font> <a href="hidden.html#R2">in</a>  <a href="ami_1.html#K7" target="_self">sproduct</a> <font color="Maroon">f</font>
 
<b>by </b><i><a class="ref" href="ami_1.html#D8" target="_self">Def8</a></i>;<br/>
<b>assume </b><a NAME="E3:64"/>
( <font color="Maroon">x2</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font> &amp; <font color="Maroon">y2</font> <a href="hidden.html#R2">in</a> <font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">x2</font> )
 ;<br/>

<a NAME="E4:64"/><b>then </b><i><font color="Green">E34</font></i>: 
<font color="Maroon">x2</font> <a href="cqc_lang.html#K3">.--&gt;</a> <font color="Maroon">y2</font> <a href="hidden.html#R2">in</a>  <a href="ami_1.html#K7" target="_self">sproduct</a> <font color="Maroon">f</font>
 
<b>by </b><i><a class="ref" href="ami_1.html#D8" target="_self">Def8</a></i>;<br/>
<a NAME="E5:64"/>
<font color="Maroon">x1</font>,<font color="Maroon">x2</font> <a href="funct_4.html#K4">--&gt;</a> <font color="Maroon">y1</font>,<font color="Maroon">y2</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">x1</font> <a href="cqc_lang.html#K3">.--&gt;</a> <font color="Maroon">y1</font></span>)</span> <a href="funct_4.html#K1">+*</a> <span class="p1">(<span class="default"><font color="Maroon">x2</font> <a href="cqc_lang.html#K3">.--&gt;</a> <font color="Maroon">y2</font></span>)</span>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E6:64"/>
<font color="Maroon">x1</font>,<font color="Maroon">x2</font> <a href="funct_4.html#K4">--&gt;</a> <font color="Maroon">y1</font>,<font color="Maroon">y2</font> <a href="hidden.html#R2">in</a>  <a href="ami_1.html#K7" target="_self">sproduct</a> <font color="Maroon">f</font>
 <b>by </b><i>, , <a class="ref" href="ami_1.html#D10" target="_self">Def10</a></i>;<br/>


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