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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="E1:60"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">H</font> is <a href="zf_lang.html#V6" target="_self">universal</a>
 ;<br/>

<a NAME="E2:60"/><b>then </b>
 ex <font color="Olive">x</font> being  <a href="zf_lang.html#NM1">Variable</a> st <font color="Maroon">H</font> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K8" target="_self">All</a> <font color="Olive">x</font>,<span class="p1">(<span class="default"><a href="zf_lang.html#K24" target="_self">the_scope_of</a> <font color="Maroon">H</font></span>)</span>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:60"/>
<font color="Maroon">H</font> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K8" target="_self">All</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K23" target="_self">bound_in</a> <font color="Maroon">H</font></span>)</span>,<span class="p1">(<span class="default"><a href="zf_lang.html#K24" target="_self">the_scope_of</a> <font color="Maroon">H</font></span>)</span>
 <b>by </b><i>, </i>;<br/>


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