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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="zf_lang.html#NM2">ZF-formula</a>;<br/>

<a NAME="E1:49"/>
(  <a href="zf_lang.html#K6">'not'</a> <font color="Maroon">c<sub>1</sub></font> is <a href="zf_lang.html#V4">negative</a> &amp;  <a href="zf_lang.html#K20">the_argument_of</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font> )
 
<b>by </b><i><a class="ref" href="zf_lang1.html#T3" target="_self">Th3</a>, <a class="ref" href="zf_lang.html#T16">ZF_LANG:16</a></i>;<br/>
<b>hence </b><a NAME="E2:49"/>
 <a href="zf_model.html#K2">Free</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="zf_model.html#K2">Free</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="zf_model.html#T1">ZF_MODEL:1</a></i>;<br/>


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