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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>

<a NAME="E1:25"/>
 <a href="partfun1.html#K6">id</a> <font color="Maroon">c<sub>1</sub></font> <a href="zfmodel1.html#R1">is_definable_in</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="zfmodel2.html#T24" target="_self">Th24</a></i>;<br/>
<b>hence </b><a NAME="E2:25"/>
 <a href="partfun1.html#K6">id</a> <font color="Maroon">c<sub>1</sub></font> <a href="zfmodel1.html#R2">is_parametrically_definable_in</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="zfmodel1.html#T18">ZFMODEL1:18</a></i>;<br/>


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