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<b>let </b><font color="Maroon">N</font> be   <a href="net_1.html#NM1">Pnet</a>;<br/><b>let </b><font color="Maroon">x</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="net_1.html#K1" target="_self">Elements</a> <font color="Maroon">N</font>;<br/>



<a NAME="E1:19"/>
for <font color="Olive">y</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">y</font> <a href="hidden.html#R2">in</a>  <a href="net_1.html#K3" target="_self">Post</a> <font color="Maroon">N</font>,<font color="Maroon">x</font> holds <br/><font color="Olive">y</font> <a href="hidden.html#R2">in</a>  <a href="net_1.html#K1" target="_self">Elements</a> <font color="Maroon">N</font>
 
<b>by </b><i><a class="ref" href="net_1.html#T6" target="_self">Th6</a></i>;<br/>
<b>hence </b><a NAME="E2:19"/>
 <a href="net_1.html#K3" target="_self">Post</a> <font color="Maroon">N</font>,<font color="Maroon">x</font> <a href="tarski.html#R1">c=</a>  <a href="net_1.html#K1" target="_self">Elements</a> <font color="Maroon">N</font>
 <b>by </b><i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a></i>;<br/>


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