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<b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_2.html#K2">REAL+</a> ;<br/>



<b>assume </b><a NAME="E1:16"/><i><font color="Green">E15</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K13">{}</a> 
 ;<br/>

<a NAME="E2:16"/><b>then </b><i><font color="Green">E16</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="arytm_2.html#R1">&lt;='</a> <font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="ref" href="arytm_1.html#T6" target="_self">Th6</a></i>;<br/>
<b>thus </b><font color="Maroon">c<sub>3</sub></font> <a href="arytm_1.html#K1" target="_self">-'</a> <font color="Maroon">c<sub>2</sub></font> = 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="arytm_1.html#K1" target="_self">-'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="arytm_2.html#K7">+</a> <font color="Maroon">c<sub>2</sub></font>
<b>by </b><i><a class="txt" href="arytm_1.html#E1:16"><i><font color="Green">E15</font></i></a>, <a class="ref" href="arytm_2.html#D8">ARYTM_2:def 8</a></i>
<br/>.= 
<font color="Maroon">c<sub>3</sub></font>
<b>by </b><i><a class="txt" href="arytm_1.html#E2:16"><i><font color="Green">E16</font></i></a>, <a class="ref" href="arytm_1.html#D1" target="_self">Def1</a></i>
;<br/>


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