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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="E1:5"/>
 <a href="xboole_0.html#K1">{}</a>  <a href="ordinal1.html#R1">c=</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T2">XBOOLE_1:2</a></i>;<br/>
<a NAME="E2:5"/><b>then </b>
 <a href="card_1.html#K3">alef</a> 0 <a href="ordinal1.html#R1">c=</a>  <a href="card_1.html#K3">alef</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="card_1.html#T43">CARD_1:43</a></i>;<br/>
<b>hence </b><a NAME="E3:5"/>
not  <a href="card_1.html#K3">alef</a> <font color="Maroon">c<sub>1</sub></font> is <a href="finset_1.html#V1">finite</a>
 <b>by </b><i><a class="ref" href="card_4.html#T11">CARD_4:11</a></i>;<br/>


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