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<b>let </b><font color="Maroon">x</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_2.html#K2" target="_self">REAL+</a> ;<br/><b>let </b><font color="Maroon">y</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_2.html#K2" target="_self">REAL+</a> ;<br/>



<a NAME="E1:51"/>
( <font color="Maroon">x</font> <a href="arytm_2.html#R1" target="_self">&lt;='</a> <font color="Maroon">y</font> or <font color="Maroon">y</font> <a href="arytm_2.html#R1" target="_self">&lt;='</a> <font color="Maroon">x</font> )
 
;<br/>
<b>hence </b><a NAME="E2:51"/>
 ex <font color="Olive">z</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_2.html#K2" target="_self">REAL+</a>  st <br/>( <font color="Maroon">x</font> <a href="arytm_2.html#K7" target="_self">+</a> <font color="Olive">z</font> <a href="hidden.html#R1">=</a> <font color="Maroon">y</font> or <font color="Maroon">y</font> <a href="arytm_2.html#K7" target="_self">+</a> <font color="Olive">z</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font> )
 <b>by </b><i><a class="ref" href="arytm_2.html#D4" target="_self">Def4</a></i>;<br/>


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