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<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:5"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> 3 <a href="subset_1.html#K6">\</a> 2
 ;<br/>

<a NAME="E2:5"/><b>then </b>
<font color="Maroon">x</font> <a href="hidden.html#R1">=</a> 2
 
<b>by </b><i>, <a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>
<b>hence </b><a NAME="E3:5"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> 3 <a href="subset_1.html#K6">\</a> 1
 <b>by </b><i>, <a class="ref" href="tarski.html#D2">TARSKI:def 2</a></i>;<br/>


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