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<b>let </b><font color="Maroon">a</font> be  <a href="ordinal1.html#V7">natural</a> <a href="ordinal1.html#NM2">Ordinal</a>;<br/>

<b>thus </b><a NAME="E1:42"/>
 <a href="arytm_3.html#K6" target="_self">RED</a> <a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">a</font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a> 
 <b>by </b><i><a class="ref" href="ordinal3.html#T83">ORDINAL3:83</a></i>;<br/>

<b>assume </b><a NAME="E2:42"/><i><font color="Green">E13</font></i>: 
<font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a> 
 ;<br/>

<b>thus </b> <a href="arytm_3.html#K6" target="_self">RED</a> <font color="Maroon">a</font>,<a href="xboole_0.html#K1">{}</a>  = 
<font color="Maroon">a</font> <a href="ordinal3.html#K6">div^</a> <font color="Maroon">a</font>
<b>by </b><i><a class="ref" href="arytm_3.html#T1" target="_self">Th1</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="arytm_3.html#K3" target="_self">*^</a> 1</span>)</span> <a href="ordinal3.html#K6">div^</a> <font color="Maroon">a</font>
<b>by </b><i><a class="ref" href="ordinal2.html#T56">ORDINAL2:56</a></i>
<br/>.= 
1
<b>by </b><i>, <a class="ref" href="ordinal3.html#T81">ORDINAL3:81</a></i>
;<br/>


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