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<b>let </b><font color="Maroon">X</font> be  <a href="fraenkel.html#V1">functional</a> <a href="pralg_2.html#V1" target="_self">with_common_domain</a>  <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><a NAME="E1:6"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">X</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><a href="xboole_0.html#K1">{}</a> </span><a href="tarski.html#K1">}</a></span>
 ;<br/>

<a NAME="E2:6"/>
 <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R2">in</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><a href="xboole_0.html#K1">{}</a> </span><a href="tarski.html#K1">}</a></span>
 
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>
<b>hence </b><a NAME="E3:6"/>
 <a href="pralg_2.html#K1" target="_self">DOM</a> <font color="Maroon">X</font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a> 
 <b>by </b><i>, , <a class="ref" href="relat_1.html#T60">RELAT_1:60</a></i>;<br/>


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