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 ex <font color="Olive">A</font> being  <a href="ordinal1.html#NM2">Ordinal</a> st  <a href="relat_1.html#K2">rng</a> <font color="Maroon">phi</font> <a href="tarski.html#R1">c=</a> <font color="Olive">A</font>
 
<b>by </b><i><a class="ref" href="ordinal2.html#D8">ORDINAL2:def 8</a></i>;<br/>
<a NAME="E2:8_1_1"/><b>then </b>
(  <a href="ordinal1.html#K3">On</a> <span class="p1">(<span class="default"><a href="relat_1.html#K2">rng</a> <font color="Maroon">phi</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="relat_1.html#K2">rng</a> <font color="Maroon">phi</font> &amp;  <a href="tarski.html#K3">union</a> <span class="p1">(<span class="default"><a href="relat_1.html#K2">rng</a> <font color="Maroon">phi</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="card_3.html#K3">Union</a> <font color="Maroon">phi</font> )
 
<b>by </b><i><a class="ref" href="ordinal3.html#T8">ORDINAL3:8</a></i>;<br/>
<b>hence </b><a NAME="E3:8_1_1"/>
 <a href="card_3.html#K3">Union</a> <font color="Maroon">phi</font> is <a href="ordinal1.html#V3">ordinal</a>
 <b>by </b><i><a class="ref" href="ordinal3.html#T7">ORDINAL3:7</a></i>;<br/>


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