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<b>let </b><font color="Maroon">W</font> be   <a href="classes2.html#NM1">Universe</a>;<br/>

<a NAME="E1:2"/>
( <font color="Maroon">W</font> is <a href="ordinal1.html#V1">epsilon-transitive</a> &amp; ( for <font color="Olive">u</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">W</font> holds   <a href="classes2.html#K3">union</a> <font color="Olive">u</font> <a href="hidden.html#R2">in</a> <font color="Maroon">W</font> ) )
 
;<br/>
<b>hence </b><a NAME="E2:2"/>
<font color="Maroon">W</font> <a href="zf_model.html#R2">|=</a>  <a href="zf_model.html#K8">the_axiom_of_unions</a> 
 <b>by </b><i><a class="ref" href="zfmodel1.html#T4">ZFMODEL1:4</a></i>;<br/>


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