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<b>let </b><font color="Maroon" title="c1">x</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="membered.html#D4" target="_self" title="MEMBERED:def.4">MEMBERED:def 4</a><br/>

<b>thus </b><a NAME="E1:5_4_1"/>
( <font color="Maroon" title="c1">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="numbers.html#K3" title="NUMBERS:func.3">RAT</a>  implies <font color="Maroon" title="c1">x</font> is <a href="rat_1.html#V1" title="RAT_1:attr.1">rational</a> )
 <b>by </b><i><a class="ref" href="rat_1.html#D2" title="RAT_1:def.2">RAT_1:def 2</a></i>;<br/>


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