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<b>let </b><font color="Maroon" title="c1">a</font>, <font color="Maroon" title="c2">b</font>, <font color="Maroon" title="c3">x</font>, <font color="Maroon" title="c4">y</font>, <font color="Maroon" title="c5">x'</font>, <font color="Maroon" title="c6">y'</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:73"/><i><font color="Green" title="E42">A1</font></i>: 
<font color="Maroon" title="c1">a</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c2">b</font>
 <b>and </b><br/><a NAME="E2:73"/><i><font color="Green" title="E43">A2</font></i>: 
<font color="Maroon" title="c1">a</font>,<font color="Maroon" title="c2">b</font> <a href="funct_4.html#K4" title="FUNCT_4:func.4">--&gt;</a> <font color="Maroon" title="c3">x</font>,<font color="Maroon" title="c4">y</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">a</font>,<font color="Maroon" title="c2">b</font> <a href="funct_4.html#K4" title="FUNCT_4:func.4">--&gt;</a> <font color="Maroon" title="c5">x'</font>,<font color="Maroon" title="c6">y'</font>
 ;<br/>

<b>thus </b><font color="Maroon" title="c3">x</font> = 
<span class="p1">(<span class="default"><font color="Maroon" title="c1">a</font>,<font color="Maroon" title="c2">b</font> <a href="funct_4.html#K4" title="FUNCT_4:func.4">--&gt;</a> <font color="Maroon" title="c3">x</font>,<font color="Maroon" title="c4">y</font></span>)</span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c1">a</font>
<b>by </b><i><a class="txt" href="funct_4.html#E1:73"><i><font color="Green" title="E42">A1</font></i></a>, <a class="ref" href="funct_4.html#T66" target="_self" title="FUNCT_4:th.66">Th66</a></i>
<br/>.= 
<font color="Maroon" title="c5">x'</font>
<b>by </b><i><a class="txt" href="funct_4.html#E1:73"><i><font color="Green" title="E42">A1</font></i></a>, <a class="txt" href="funct_4.html#E2:73"><i><font color="Green" title="E43">A2</font></i></a>, <a class="ref" href="funct_4.html#T66" target="_self" title="FUNCT_4:th.66">Th66</a></i>
;<br/>

<b>thus </b><font color="Maroon" title="c4">y</font> = 
<span class="p1">(<span class="default"><font color="Maroon" title="c1">a</font>,<font color="Maroon" title="c2">b</font> <a href="funct_4.html#K4" title="FUNCT_4:func.4">--&gt;</a> <font color="Maroon" title="c3">x</font>,<font color="Maroon" title="c4">y</font></span>)</span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c2">b</font>
<b>by </b><i><a class="ref" href="funct_4.html#T66" target="_self" title="FUNCT_4:th.66">Th66</a></i>
<br/>.= 
<font color="Maroon" title="c6">y'</font>
<b>by </b><i><a class="txt" href="funct_4.html#E2:73"><i><font color="Green" title="E43">A2</font></i></a>, <a class="ref" href="funct_4.html#T66" target="_self" title="FUNCT_4:th.66">Th66</a></i>
;<br/>


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