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

<a NAME="E1:34"/>
<font color="Maroon">c<sub>2</sub></font> <a href="arytm_2.html#R1">&lt;='</a> <font color="Maroon">c<sub>2</sub></font>
 
;<br/>
<a NAME="E2:34"/><b>then </b>
<font color="Maroon">c<sub>2</sub></font> <a href="arytm_1.html#K2" target="_self">-</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>2</sub></font> <a href="arytm_1.html#K1" target="_self">-'</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="arytm_1.html#D2" target="_self">Def2</a></i>;<br/>
<b>hence </b><a NAME="E3:34"/>
<font color="Maroon">c<sub>2</sub></font> <a href="arytm_1.html#K2" target="_self">-</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i><a class="txt" href="arytm_1.html#E13"><i><font color="Green">Lemma11</font></i></a></i>;<br/>


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