<?xml version="1.0"?>
<div class="add">

<b>take </b>
 <a href="tarski.html#K3">union</a> <span class="p1"><a href="tarski.html#K2">{</a><span class="default"><span class="p2"><a href="enumset1.html#K5" target="_self">{</a><span class="default"><font color="Maroon">x1</font>,<font color="Maroon">x2</font>,<font color="Maroon">x3</font>,<font color="Maroon">x4</font>,<font color="Maroon">x5</font>,<font color="Maroon">x6</font>,<font color="Maroon">x7</font></span><a href="enumset1.html#K5" target="_self">}</a></span>,<span class="p2"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">x8</font></span><a href="tarski.html#K1">}</a></span></span><a href="tarski.html#K2">}</a></span>
;<br/>

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<a NAME="E1:7_1_1"/>
( <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="enumset1.html#K5" target="_self">{</a><span class="default"><font color="Maroon">x1</font>,<font color="Maroon">x2</font>,<font color="Maroon">x3</font>,<font color="Maroon">x4</font>,<font color="Maroon">x5</font>,<font color="Maroon">x6</font>,<font color="Maroon">x7</font></span><a href="enumset1.html#K5" target="_self">}</a></span> iff ( <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x1</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x2</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x3</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x4</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x5</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x6</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x7</font> ) )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:7_1_1"/>
( <font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="tarski.html#K3">union</a> <span class="p1"><a href="tarski.html#K2">{</a><span class="default"><span class="p2"><a href="enumset1.html#K5" target="_self">{</a><span class="default"><font color="Maroon">x1</font>,<font color="Maroon">x2</font>,<font color="Maroon">x3</font>,<font color="Maroon">x4</font>,<font color="Maroon">x5</font>,<font color="Maroon">x6</font>,<font color="Maroon">x7</font></span><a href="enumset1.html#K5" target="_self">}</a></span>,<span class="p2"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">x8</font></span><a href="tarski.html#K1">}</a></span></span><a href="tarski.html#K2">}</a></span> iff ( <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x1</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x2</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x3</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x4</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x5</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x6</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x7</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x8</font> ) )
 <b>by </b><i/>;<br/>


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