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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="ordinal1.html#NM2">Ordinal</a>;<br/>

<a NAME="E1:21"/><i><font color="Green">E9</font></i>: 
 <a href="wellord2.html#K1">RelIncl</a> <font color="Maroon">c<sub>1</sub></font> is <a href="wellord1.html#V2">well-ordering</a>
 
<b>by </b><i><a class="ref" href="wellord2.html#T7">WELLORD2:7</a></i>;<br/>
<a NAME="E2:21"/>
 <a href="wellord2.html#K1">RelIncl</a> <font color="Maroon">c<sub>1</sub></font>, <a href="wellord2.html#K1">RelIncl</a> <font color="Maroon">c<sub>1</sub></font> <a href="wellord1.html#R4">are_isomorphic</a> 
 
<b>by </b><i><a class="ref" href="wellord1.html#T48">WELLORD1:48</a></i>;<br/>
<b>hence </b><a NAME="E3:21"/>
 <a href="wellord2.html#K2">order_type_of</a> <span class="p1">(<span class="default"><a href="wellord2.html#K1">RelIncl</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="amistd_3.html#E1:21"><i><font color="Green">E9</font></i></a>, <a class="ref" href="wellord2.html#D2">WELLORD2:def 2</a></i>;<br/>


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