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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/>

<b>assume </b><a NAME="E1:61"/><i><font color="Green">E49</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="zf_lang.html#V11" target="_self">existential</a>
 ;<br/>

<a NAME="E2:61"/><b>then </b>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="zf_lang.html#NM1">Variable</a> st <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K13" target="_self">Ex</a> <font color="Olive">b<sub>1</sub></font>,<span class="p1">(<span class="default"><a href="zf_lang.html#K24" target="_self">the_scope_of</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
 
<b>by </b><i><a class="ref" href="zf_lang.html#T61" target="_self">Th61</a></i>;<br/>
<b>hence </b><a NAME="E3:61"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K13" target="_self">Ex</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K23" target="_self">bound_in</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>,<span class="p1">(<span class="default"><a href="zf_lang.html#K24" target="_self">the_scope_of</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
 <b>by </b><i><a class="txt" href="zf_lang.html#E1:61"><i><font color="Green">E49</font></i></a>, <a class="ref" href="zf_lang.html#T61" target="_self">Th61</a></i>;<br/>


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