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<b>let </b><font color="Maroon" title="c3">R</font> be    <a href="relset_1.html#M2" title="RELSET_1:mode.2">Relation</a> of <font color="Maroon" title="c1">X</font>,<font color="Maroon" title="c2">Y</font>;<br/>

<b>thus </b><a NAME="E1:3_1_1"/>
 <a href="relset_1.html#K5" title="RELSET_1:func.5">rng</a> <font color="Maroon" title="c3">R</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a> 
 <b>by </b><i><a class="ref" href="membered.html#T3" title="MEMBERED:th.3">MEMBERED:3</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="seq_1.html#D1" title="SEQ_1:def.1">SEQ_1:def 1</a><br/>


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