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<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:7"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="qc_lang1.html#K5" target="_self">QC-pred_symbols</a> 
 ;<br/>

<a NAME="E2:7"/><b>then </b>
 ex <font color="Olive">k</font>, <font color="Olive">l</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a>  st <br/>( <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Olive">k</font>,<font color="Olive">l</font></span><a href="tarski.html#K4">]</a></span> &amp; 7 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Olive">k</font> )
 
;<br/>
<b>hence </b><a NAME="E3:7"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="mcart_1.html#K12">[:</a><span class="default"><a href="numbers.html#K5">NAT</a> ,<a href="numbers.html#K5">NAT</a> </span><a href="mcart_1.html#K12">:]</a></span>
 <b>by </b><i><a class="ref" href="zfmisc_1.html#D2">ZFMISC_1:def 2</a></i>;<br/>


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