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<b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">Y</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:5"/><i><font color="Green">E19</font></i>: 
<font color="Maroon">X</font>,<font color="Maroon">Y</font> <a href="wellord2.html#R2">are_equipotent</a> 
 <b>and </b><br/><a NAME="E2:5"/><i><font color="Green">E20</font></i>: 
 <a href="card_1.html#K1">Card</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a>  <a href="card_1.html#K3">alef</a> 0
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="card_4.html#D1">CARD_4:def 1</a><br/>

<b>thus </b><a NAME="E3:5"/>
 <a href="card_1.html#K1">Card</a> <font color="Maroon">Y</font> <a href="tarski.html#R1">c=</a>  <a href="card_1.html#K3">alef</a> 0
 <b>by </b><i>, , <a class="ref" href="card_1.html#T21">CARD_1:21</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="card_4.html#D1">CARD_4:def 1</a><br/>


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