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<b>let </b><font color="Maroon">R</font> be   <a href="relat_1.html#NM1">Relation</a>;<br/><b>let </b><font color="Maroon">A</font> be   <a href="ordinal1.html#NM2">Ordinal</a>;<br/><b>let </b><font color="Maroon">B</font> be   <a href="ordinal1.html#NM2">Ordinal</a>;<br/>





<b>assume </b><b>that </b><br/><a NAME="E1:12"/><i><font color="Green">E21</font></i>: 
<font color="Maroon">R</font>, <a href="wellord2.html#K1" target="_self">RelIncl</a> <font color="Maroon">A</font> <a href="wellord1.html#R4">are_isomorphic</a> 
 <b>and </b><br/><a NAME="E2:12"/><i><font color="Green">E22</font></i>: 
<font color="Maroon">R</font>, <a href="wellord2.html#K1" target="_self">RelIncl</a> <font color="Maroon">B</font> <a href="wellord1.html#R4">are_isomorphic</a> 
 ;<br/>

<a NAME="E3:12"/>
 <a href="wellord2.html#K1" target="_self">RelIncl</a> <font color="Maroon">A</font>,<font color="Maroon">R</font> <a href="wellord1.html#R4">are_isomorphic</a> 
 
<b>by </b><i>, <a class="ref" href="wellord1.html#T50">WELLORD1:50</a></i>;<br/>
<a NAME="E4:12"/><b>then </b>
 <a href="wellord2.html#K1" target="_self">RelIncl</a> <font color="Maroon">A</font>, <a href="wellord2.html#K1" target="_self">RelIncl</a> <font color="Maroon">B</font> <a href="wellord1.html#R4">are_isomorphic</a> 
 
<b>by </b><i>, <a class="ref" href="wellord1.html#T52">WELLORD1:52</a></i>;<br/>
<b>hence </b><a NAME="E5:12"/>
<font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <font color="Maroon">B</font>
 <b>by </b><i/>;<br/>


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