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<b>let </b><font color="Maroon">e</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="membered.html#D2" target="_self">MEMBERED:def 2</a><br/>

<b>thus </b><a NAME="E1:40_1_1"/>
( <font color="Maroon">e</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="tarski.html#K2">{</a><span class="default"><font color="Maroon">r1</font>,<font color="Maroon">r2</font></span><a href="tarski.html#K2">}</a></span> implies <font color="Maroon">e</font> is <a href="xreal_0.html#V1">real</a> )
 <b>by </b><i><a class="ref" href="tarski.html#D2">TARSKI:def 2</a></i>;<br/>


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