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<b>let </b><font color="Maroon" title="c1">M</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>

<a NAME="E1:25"/>
 <a href="partfun1.html#K6" title="PARTFUN1:func.6">id</a> <font color="Maroon" title="c1">M</font> <a href="zfmodel1.html#R1" title="ZFMODEL1:pred.1">is_definable_in</a> <font color="Maroon" title="c1">M</font>
 
<b>by </b><i><a class="ref" href="zfmodel2.html#T24" target="_self" title="ZFMODEL2:th.24">Th24</a></i>;<br/>
<b>hence </b><a NAME="E2:25"/>
 <a href="partfun1.html#K6" title="PARTFUN1:func.6">id</a> <font color="Maroon" title="c1">M</font> <a href="zfmodel1.html#R2" title="ZFMODEL1:pred.2">is_parametrically_definable_in</a> <font color="Maroon" title="c1">M</font>
 <b>by </b><i><a class="ref" href="zfmodel1.html#T18" title="ZFMODEL1:th.18">ZFMODEL1:18</a></i>;<br/>


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