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<b>let </b><font color="Maroon" title="c3">b</font>, <font color="Maroon" title="c4">a</font> be  <a href="ordinal1.html#V7" title="ORDINAL1:attr.7">natural</a> <a href="ordinal1.html#NM2" title="ORDINAL1:NM.2">Ordinal</a>;<br/>



<a NAME="E1:63"/>
(  <a href="arytm_3.html#K6" title="ARYTM_3:func.6">RED</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> ,<font color="Maroon" title="c3">b</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  &amp; ( <font color="Maroon" title="c3">b</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  implies  <a href="arytm_3.html#K6" title="ARYTM_3:func.6">RED</a> <font color="Maroon" title="c3">b</font>,<a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1 ) )
 
<b>by </b><i><a class="ref" href="arytm_3.html#T31" target="_self" title="ARYTM_3:th.31">Th31</a></i>;<br/>
<b>hence </b><a NAME="E2:63"/>
<a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <a href="arytm_3.html#K10" title="ARYTM_3:func.10">/</a> <font color="Maroon" title="c3">b</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
 <b>by </b><i><a class="ref" href="arytm_3.html#D10" target="_self" title="ARYTM_3:def.10">Def10</a></i>;<br/>

<a NAME="E3:63"/>
(  <a href="arytm_3.html#K6" title="ARYTM_3:func.6">RED</a> 1,<font color="Maroon" title="c4">a</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1 &amp;  <a href="arytm_3.html#K6" title="ARYTM_3:func.6">RED</a> <font color="Maroon" title="c4">a</font>,1 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c4">a</font> )
 
<b>by </b><i><a class="ref" href="arytm_3.html#T29" target="_self" title="ARYTM_3:th.29">Th29</a></i>;<br/>
<b>hence </b><a NAME="E4:63"/>
<font color="Maroon" title="c4">a</font> <a href="arytm_3.html#K10" title="ARYTM_3:func.10">/</a> 1 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c4">a</font>
 <b>by </b><i><a class="ref" href="arytm_3.html#D10" target="_self" title="ARYTM_3:def.10">Def10</a></i>;<br/>


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