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<b>let </b><font color="Maroon">M</font> be   <a href="card_1.html#NM1">Cardinal</a>;<br/>

<a NAME="E1:22"/><i><font color="Green">E35</font></i>: 
( <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><a href="xboole_0.html#K1">{}</a> ,<span class="p2"><a href="tarski.html#K1">{</a><span class="default">1</span><a href="tarski.html#K1">}</a></span></span><a href="zfmisc_1.html#K2">:]</a></span> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  &amp; <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><a href="xboole_0.html#K1">{}</a> ,<span class="p2"><a href="tarski.html#K1">{</a><span class="default">0</span><a href="tarski.html#K1">}</a></span></span><a href="zfmisc_1.html#K2">:]</a></span> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  )
 
<b>by </b><i><a class="ref" href="zfmisc_1.html#T113">ZFMISC_1:113</a></i>;<br/>
<b>thus </b><font color="Maroon">M</font> <a href="card_2.html#K1" target="_self">+`</a> 0 = 
 <a href="card_1.html#K1">Card</a> <font color="Maroon">H<sub>3</sub></font>(<font color="Maroon">M</font>, <a href="xboole_0.html#K1">{}</a> )
<b>by </b><i/>
<br/>.= 
 <a href="card_1.html#K1">Card</a> <font color="Maroon">M</font>
<b>by </b><i>, </i>
<br/>.= 
<font color="Maroon">M</font>
<b>by </b><i><a class="ref" href="card_1.html#D5">CARD_1:def 5</a></i>
;<br/>


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