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<b>let </b><font color="Maroon">A</font> be   <a href="ordinal1.html#NM2">Ordinal</a>;<br/><b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/>



<b>assume </b><a NAME="E1:11"/>
<font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">A</font>
 ;<br/>

<a NAME="E2:11"/><b>then </b>
 <a href="ordinal1.html#K3">On</a> <font color="Maroon">X</font> <a href="hidden.html#R1">=</a> <font color="Maroon">X</font>
 
<b>by </b><i/>;<br/>
<a NAME="E3:11"/><b>then </b>
 <a href="ordinal2.html#K2">inf</a> <font color="Maroon">X</font> <a href="hidden.html#R1">=</a>  <a href="setfam_1.html#K1">meet</a> <font color="Maroon">X</font>
 
<b>by </b><i><a class="ref" href="ordinal2.html#D6">ORDINAL2:def 6</a></i>;<br/>
<b>hence </b><a NAME="E4:11"/>
 <a href="setfam_1.html#K1">meet</a> <font color="Maroon">X</font> is   <a href="ordinal1.html#NM2">Ordinal</a>
 ;<br/>


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