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<b>let </b><font color="Maroon" title="c3">x</font>, <font color="Maroon" title="c4">y</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="arytm_3.html#K7" title="ARYTM_3:func.7">RAT+</a> ;<br/>



<b>assume </b><a NAME="E1:81"/>
<font color="Maroon" title="c3">x</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a>  <a href="arytm_3.html#K13" title="ARYTM_3:func.13">{}</a> 
 ;<br/>

<b>then consider </b><font color="Maroon" title="c5">z</font> being    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="arytm_3.html#K7" title="ARYTM_3:func.7">RAT+</a> <b> such that </b><br/><a NAME="E3:81"/><i><font color="Green" title="E68">A1</font></i>: 
<font color="Maroon" title="c3">x</font> <a href="arytm_3.html#K12" title="ARYTM_3:func.12">*'</a> <font color="Maroon" title="c5">z</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1
 <b>by </b><i><a class="ref" href="arytm_3.html#T60" target="_self" title="ARYTM_3:th.60">Th60</a></i>;<br/>
<b>reconsider </b><font color="Maroon" title="c6">o</font> =  <a href="arytm_3.html#K14" title="ARYTM_3:func.14">one</a>  as    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="arytm_3.html#K7" title="ARYTM_3:func.7">RAT+</a>  ;<br/>
<b>take </b>
<font color="Maroon" title="c5">z</font> <a href="arytm_3.html#K12" title="ARYTM_3:func.12">*'</a> <font color="Maroon" title="c4">y</font>
;<br/>

<b>thus </b><font color="Maroon" title="c4">y</font> = 
<font color="Maroon" title="c4">y</font> <a href="arytm_3.html#K12" title="ARYTM_3:func.12">*'</a> <font color="Maroon" title="c6">o</font>
<b>by </b><i><a class="ref" href="arytm_3.html#T59" target="_self" title="ARYTM_3:th.59">Th59</a></i>
<br/>.= 
<font color="Maroon" title="c3">x</font> <a href="arytm_3.html#K12" title="ARYTM_3:func.12">*'</a> <span class="p1">(<span class="default"><font color="Maroon" title="c5">z</font> <a href="arytm_3.html#K12" title="ARYTM_3:func.12">*'</a> <font color="Maroon" title="c4">y</font></span>)</span>
<b>by </b><i><a class="txt" href="arytm_3.html#E3:81"><i><font color="Green" title="E68">A1</font></i></a>, <a class="ref" href="arytm_3.html#T58" target="_self" title="ARYTM_3:th.58">Th58</a></i>
;<br/>


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