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

<b>assume </b><a NAME="E1:27"/>
<font color="Maroon">H</font> is <a href="zf_lang.html#V11">existential</a>
 ;<br/>

<a NAME="E2:27"/><b>then </b>
<font color="Maroon">H</font> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K13">Ex</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K23">bound_in</a> <font color="Maroon">H</font></span>)</span>,<span class="p1">(<span class="default"><a href="zf_lang.html#K24">the_scope_of</a> <font color="Maroon">H</font></span>)</span>
 
<b>by </b><i><a class="ref" href="zf_lang.html#T63">ZF_LANG:63</a></i>;<br/>
<a NAME="E3:27"/><b>then </b><i><font color="Green">E46</font></i>: 
<font color="Maroon">H</font> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K6">'not'</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <span class="p2">(<span class="default"><a href="zf_lang.html#K23">bound_in</a> <font color="Maroon">H</font></span>)</span>,<span class="p2">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K24">the_scope_of</a> <font color="Maroon">H</font></span>)</span></span>)</span></span>)</span>
 
;<br/>
<b>hence </b><a NAME="E4:27"/>
<font color="Maroon">H</font> is <a href="zf_lang.html#V4">negative</a>
 <b>by </b><i><a class="ref" href="zf_lang.html#T16">ZF_LANG:16</a></i>;<br/>

<a NAME="E5:27"/><i><font color="Green">E48</font></i>: 
 <a href="zf_lang.html#K20">the_argument_of</a> <font color="Maroon">H</font> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K8">All</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K23">bound_in</a> <font color="Maroon">H</font></span>)</span>,<span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <span class="p2">(<span class="default"><a href="zf_lang.html#K24">the_scope_of</a> <font color="Maroon">H</font></span>)</span></span>)</span>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E6:27"/>
 <a href="zf_lang.html#K20">the_argument_of</a> <font color="Maroon">H</font> is <a href="zf_lang.html#V6">universal</a>
 <b>by </b><i><a class="ref" href="zf_lang.html#T16">ZF_LANG:16</a></i>;<br/>

<a NAME="E7:27"/>
 <a href="zf_lang.html#K6">'not'</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K24">the_scope_of</a> <font color="Maroon">H</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K24">the_scope_of</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K20">the_argument_of</a> <font color="Maroon">H</font></span>)</span>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E8:27"/>
 <a href="zf_lang.html#K24">the_scope_of</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K20">the_argument_of</a> <font color="Maroon">H</font></span>)</span> is <a href="zf_lang.html#V4">negative</a>
 <b>by </b><i><a class="ref" href="zf_lang.html#T16">ZF_LANG:16</a></i>;<br/>


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