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<b>let </b><font color="Maroon">k</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">P</font> be   <a href="qc_lang1.html#NM6">QC-pred_symbol</a> of <font color="Maroon">k</font>;<br/><b>let </b><font color="Maroon">l</font> be    <a href="qc_lang1.html#M1">QC-variable_list</a> of <font color="Maroon">k</font>;<br/>





<a NAME="E1:13"/><i><font color="Green">E39</font></i>: 
<font color="Maroon">P</font> <a href="qc_lang1.html#K9">!</a> <font color="Maroon">l</font> is <a href="qc_lang1.html#V2">atomic</a>
 
<b>by </b><i><a class="ref" href="qc_lang1.html#D17">QC_LANG1:def 17</a></i>;<br/>
<a NAME="E2:13"/><b>then </b>
 <a href="qc_lang1.html#K16">the_arguments_of</a> <span class="p1">(<span class="default"><font color="Maroon">P</font> <a href="qc_lang1.html#K9">!</a> <font color="Maroon">l</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">l</font>
 
<b>by </b><i><a class="ref" href="qc_lang1.html#D22">QC_LANG1:def 22</a></i>;<br/>
<b>hence </b><a NAME="E3:13"/>
 <a href="qc_lang1.html#K23">still_not-bound_in</a> <span class="p1">(<span class="default"><font color="Maroon">P</font> <a href="qc_lang1.html#K9">!</a> <font color="Maroon">l</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="qc_lang1.html#K22">still_not-bound_in</a> <font color="Maroon">l</font>
 <b>by </b><i>, </i>;<br/>


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