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<b>consider </b><font color="Maroon">x1</font> being    <a href="hidden.html#M1">set</a> , <font color="Maroon">x2</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E2:53_1_1"/><i><font color="Green">E37</font></i>: 
( <font color="Maroon">x1</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default">3</span><a href="domain_1.html#K6">}</a></span> &amp; <font color="Maroon">x2</font> <a href="hidden.html#R2">in</a>  <a href="numbers.html#K5">NAT</a>  &amp; <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Maroon">x1</font>,<font color="Maroon">x2</font></span><a href="tarski.html#K4">]</a></span> )
 <b>by </b><i><a class="ref" href="zfmisc_1.html#D2">ZFMISC_1:def 2</a></i>;<br/>
<a NAME="E3:53_1_1"/>
<font color="Maroon">x1</font> <a href="hidden.html#R1">=</a> 3
 
<b>by </b><i><a class="txt" href="modal_1.html#E2:53_1_1"><i><font color="Green">E37</font></i></a>, <a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>
<b>hence </b><a NAME="E4:53_1_1"/>
<span class="p1">(<span class="default"><a href="trees_1.html#K2">elementary_tree</a> 0</span>)</span> <a href="trees_2.html#K9">--&gt;</a> <font color="Maroon">p</font> is   <a href="modal_1.html#NM5">MP-wff</a>
 <b>by </b><i><a class="txt" href="modal_1.html#E2:53_1_1"><i><font color="Green">E37</font></i></a>, </i>;<br/>


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