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<b>let </b><font color="Maroon" title="c3">R1</font>, <font color="Maroon" title="c4">R2</font> be   <a href="prob_1.html#NM3" title="PROB_1:NM.3">SigmaField</a> of <font color="Maroon" title="c1">Omega</font>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:68_1_1"/><i><font color="Green" title="E42">A1</font></i>: 
( <font color="Maroon" title="c2">X</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c3">R1</font> &amp; ( for <font color="Olive" title="b1">Z</font> being   <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a>   st <font color="Maroon" title="c2">X</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Olive" title="b1">Z</font> &amp; <font color="Olive" title="b1">Z</font> is   <a href="prob_1.html#NM3" title="PROB_1:NM.3">SigmaField</a> of <font color="Maroon" title="c1">Omega</font> holds <br/><font color="Maroon" title="c3">R1</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Olive" title="b1">Z</font> ) )
 <b>and </b><br/><a NAME="E2:68_1_1"/><i><font color="Green" title="E43">A2</font></i>: 
( <font color="Maroon" title="c2">X</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c4">R2</font> &amp; ( for <font color="Olive" title="b1">Z</font> being   <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a>   st <font color="Maroon" title="c2">X</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Olive" title="b1">Z</font> &amp; <font color="Olive" title="b1">Z</font> is   <a href="prob_1.html#NM3" title="PROB_1:NM.3">SigmaField</a> of <font color="Maroon" title="c1">Omega</font> holds <br/><font color="Maroon" title="c4">R2</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Olive" title="b1">Z</font> ) )
 ;<br/>

<a NAME="E3:68_1_1"/><i><font color="Green" title="E44">A3</font></i>: 
<font color="Maroon" title="c3">R1</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c4">R2</font>
 
<b>by </b><i><a class="txt" href="prob_1.html#E1:68_1_1"><i><font color="Green" title="E42">A1</font></i></a>, <a class="txt" href="prob_1.html#E2:68_1_1"><i><font color="Green" title="E43">A2</font></i></a></i>;<br/>
<a NAME="E4:68_1_1"/>
<font color="Maroon" title="c4">R2</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c3">R1</font>
 
<b>by </b><i><a class="txt" href="prob_1.html#E1:68_1_1"><i><font color="Green" title="E42">A1</font></i></a>, <a class="txt" href="prob_1.html#E2:68_1_1"><i><font color="Green" title="E43">A2</font></i></a></i>;<br/>
<b>hence </b><a NAME="E5:68_1_1"/>
<font color="Maroon" title="c3">R1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c4">R2</font>
 <b>by </b><i><a class="txt" href="prob_1.html#E3:68_1_1"><i><font color="Green" title="E44">A3</font></i></a>, <a class="ref" href="xboole_0.html#D10" title="XBOOLE_0:def.10">XBOOLE_0:def 10</a></i>;<br/>


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