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<b>let </b><font color="Maroon">s</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> ;<br/><b>let </b><font color="Maroon">t</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a> ;<br/>



<b>assume </b><a NAME="E1:9"/><i><font color="Green">E19</font></i>: 
for <font color="Olive">r</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="arytm_3.html#K7">RAT+</a>  holds <br/> ( <font color="Olive">r</font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">s</font> iff <font color="Olive">r</font> <a href="arytm_3.html#NR4" target="_self">&lt;</a> <font color="Maroon">t</font> )
 ;<br/>

<a NAME="E2:9"/>
( <font color="Maroon">s</font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">s</font> &amp; <font color="Maroon">t</font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">t</font> )
 
;<br/>
<a NAME="E3:9"/><b>then </b>
( <font color="Maroon">s</font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">t</font> &amp; <font color="Maroon">t</font> <a href="arytm_3.html#R3">&lt;='</a> <font color="Maroon">s</font> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E4:9"/>
<font color="Maroon">s</font> <a href="hidden.html#R1">=</a> <font color="Maroon">t</font>
 <b>by </b><i><a class="ref" href="arytm_3.html#T73">ARYTM_3:73</a></i>;<br/>


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