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

<b>assume </b><a NAME="E1:23"/><i><font color="Green">E33</font></i>: 
for <font color="Olive">x</font> being <a href="facirc_1.html#V1" target="_self">pair</a>  <a href="hidden.html#M1">set</a>   holds not <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="facirc_1.html#D2" target="_self">FACIRC_1:def 2</a><br/>

<b>assume </b><a NAME="E2:23"/><i><font color="Green">E35</font></i>: 
<font color="Maroon">R</font> is   <a href="relat_1.html#NM1">Relation</a>
 ;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="23_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>assume </b><a NAME="E1:23_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font>
 ;<br/><a NAME="E2:23_1"/><b>then </b>
for <font color="Olive">z1</font>, <font color="Olive">z2</font> being   <a href="hidden.html#M1">set</a>   holds not <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Olive">z1</font>,<font color="Olive">z2</font></span><a href="tarski.html#K4">]</a></span>
 <b>by </b><i/>;<br/><b>hence </b><a NAME="E3:23_1"/>
not <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">R</font>
 <b>by </b><i>, <a class="ref" href="relat_1.html#D1">RELAT_1:def 1</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E4:23"/>
<font color="Maroon">X</font> <a href="xboole_0.html#R1">misses</a> <font color="Maroon">R</font>
 <b>by </b><i><a class="ref" href="xboole_0.html#T3">XBOOLE_0:3</a></i>;<br/>


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