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<b>thus </b><i><font color="Green">E2</font></i>: 1 = 
 <a href="ordinal1.html#K1">succ</a> 0

<br/>.= 
0 <a href="xboole_0.html#K2">\/</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default">0</span><a href="tarski.html#K1">}</a></span>
<b>by </b><i><a class="ref" href="ordinal1.html#D1">ORDINAL1:def 1</a></i>
<br/>.= 
<span class="p1"><a href="tarski.html#K1">{</a><span class="default">0</span><a href="tarski.html#K1">}</a></span>

;<br/>

<b>thus </b>2 = 
 <a href="ordinal1.html#K1">succ</a> 1

<br/>.= 
1 <a href="xboole_0.html#K2">\/</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default">1</span><a href="tarski.html#K1">}</a></span>
<b>by </b><i><a class="ref" href="ordinal1.html#D1">ORDINAL1:def 1</a></i>
<br/>.= 
<span class="p1"><a href="tarski.html#K2">{</a><span class="default">0,1</span><a href="tarski.html#K2">}</a></span>
<b>by </b><i><a class="txt" href="card_5.html#E1:1"><i><font color="Green">E2</font></i></a>, <a class="ref" href="enumset1.html#T41">ENUMSET1:41</a></i>
;<br/>


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