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<b>let </b><font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a> ;<br/>



<b>assume </b><b>that </b><br/><a NAME="E1:26"/><i><font color="Green">E26</font></i>: 
 <a href="arytm_0.html#K2" target="_self">*</a> <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R1">=</a> 0
 <b>and </b><br/><a NAME="E2:26"/><i><font color="Green">E27</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 ;<br/>

<a NAME="E3:26"/><i><font color="Green">E28</font></i>: 
 <a href="arytm_0.html#K2" target="_self">*</a> <font color="Maroon">c<sub>4</sub></font>,<span class="p1">(<span class="default"><a href="arytm_0.html#K4" target="_self">inv</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="hidden.html#R1">=</a> 1
 
<b>by </b><i><a class="txt" href="arytm_0.html#E2:26"><i><font color="Green">E27</font></i></a>, <a class="ref" href="arytm_0.html#D5" target="_self">Def5</a></i>;<br/>
<b>thus </b><font color="Maroon">c<sub>5</sub></font> = 
 <a href="arytm_0.html#K2" target="_self">*</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>5</sub></font>
<b>by </b><i><a class="ref" href="arytm_0.html#T21" target="_self">Th21</a></i>
<br/>.= 
 <a href="arytm_0.html#K2" target="_self">*</a> <span class="p1">(<span class="default"><a href="arytm_0.html#K2" target="_self">*</a> <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font></span>)</span>,<span class="p1">(<span class="default"><a href="arytm_0.html#K4" target="_self">inv</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="arytm_0.html#E3:26"><i><font color="Green">E28</font></i></a>, <a class="ref" href="arytm_0.html#T15" target="_self">Th15</a></i>
<br/>.= 
0
<b>by </b><i><a class="txt" href="arytm_0.html#E1:26"><i><font color="Green">E26</font></i></a>, <a class="ref" href="arytm_0.html#T14" target="_self">Th14</a></i>
;<br/>


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