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<b>let </b><font color="Maroon">R</font> be    <a href="relset_1.html#M2">Relation</a> of <font color="Maroon">X</font>,<font color="Maroon">Y</font>;<br/>

<b>thus </b><a NAME="E1:3_1_1"/>
 <a href="relset_1.html#K5">rng</a> <font color="Maroon">R</font> <a href="tarski.html#R1">c=</a>  <a href="numbers.html#K1">REAL</a> 
 <b>by </b><i><a class="ref" href="membered.html#T2">MEMBERED:2</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="seq_1.html#D1">SEQ_1:def 1</a><br/>


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