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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="net_1.html#L1" target="_self">Net</a> ;<br/>



<b>assume </b><a NAME="E1:5"/><i><font color="Green">E5</font></i>: 
( <font color="Maroon">c<sub>1</sub></font> is    <a href="subset_1.html#M1">Element</a> of the <a href="net_1.html#U1" target="_self">Places</a> of <font color="Maroon">c<sub>2</sub></font> &amp; the <a href="net_1.html#U1" target="_self">Places</a> of <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  )
 ;<br/>

<a NAME="E2:5"/>
the <a href="net_1.html#U1" target="_self">Places</a> of <font color="Maroon">c<sub>2</sub></font> <a href="tarski.html#R1">c=</a>  <a href="net_1.html#K1" target="_self">Elements</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="net_1.html#T4" target="_self">Th4</a></i>;<br/>
<b>hence </b><a NAME="E3:5"/>
<font color="Maroon">c<sub>1</sub></font> is    <a href="subset_1.html#M1">Element</a> of  <a href="net_1.html#K1" target="_self">Elements</a> <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="txt" href="net_1.html#E1:5"><i><font color="Green">E5</font></i></a>, <a class="ref" href="tarski.html#D3">TARSKI:def 3</a></i>;<br/>


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