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<b>let </b><font color="Maroon">x0</font> be   <a href="real_1.html#NM1">Real</a>;<br/><b>let </b><font color="Maroon">x1</font> be   <a href="real_1.html#NM1">Real</a>;<br/><b>let </b><font color="Maroon">x2</font> be   <a href="real_1.html#NM1">Real</a>;<br/><b>let </b><font color="Maroon">f</font> be   <a href="funct_2.html#NM1">Function</a> of  <a href="numbers.html#K1">REAL</a> , <a href="numbers.html#K1">REAL</a> ;<br/>







<b>assume </b><a NAME="E1:52"/><i><font color="Green">E40</font></i>: 
( <font color="Maroon">x0</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">x1</font> &amp; <font color="Maroon">x0</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">x2</font> &amp; <font color="Maroon">x1</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">x2</font> )
 ;<br/>

<a NAME="E2:52"/><b>then </b>
<span class="p1"><a href="diff_1.html#K13" target="_self">[!</a><span class="default"><font color="Maroon">f</font>,<font color="Maroon">x0</font>,<font color="Maroon">x1</font>,<font color="Maroon">x2</font></span><a href="diff_1.html#K13" target="_self">!]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="diff_1.html#K13" target="_self">[!</a><span class="default"><font color="Maroon">f</font>,<font color="Maroon">x2</font>,<font color="Maroon">x0</font>,<font color="Maroon">x1</font></span><a href="diff_1.html#K13" target="_self">!]</a></span>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:52"/>
( <span class="p1"><a href="diff_1.html#K13" target="_self">[!</a><span class="default"><font color="Maroon">f</font>,<font color="Maroon">x0</font>,<font color="Maroon">x1</font>,<font color="Maroon">x2</font></span><a href="diff_1.html#K13" target="_self">!]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="diff_1.html#K13" target="_self">[!</a><span class="default"><font color="Maroon">f</font>,<font color="Maroon">x2</font>,<font color="Maroon">x0</font>,<font color="Maroon">x1</font></span><a href="diff_1.html#K13" target="_self">!]</a></span> &amp; <span class="p1"><a href="diff_1.html#K13" target="_self">[!</a><span class="default"><font color="Maroon">f</font>,<font color="Maroon">x0</font>,<font color="Maroon">x1</font>,<font color="Maroon">x2</font></span><a href="diff_1.html#K13" target="_self">!]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="diff_1.html#K13" target="_self">[!</a><span class="default"><font color="Maroon">f</font>,<font color="Maroon">x1</font>,<font color="Maroon">x0</font>,<font color="Maroon">x2</font></span><a href="diff_1.html#K13" target="_self">!]</a></span> )
 <b>by </b><i>, </i>;<br/>


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