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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E15">Th13</font></span>: <a NAME="T16"><span class="comment"><font color="firebrick">:: EUCLID12:16</font></span><br/></a><div class="add"> <a href="euclid.html#K1" title="EUCLID:func.1">REAL</a> 2 is    <a href="subset_1.html#M2" title="SUBSET_1:mode.2">Element</a> of  <a href="euclidlp.html#K5" title="EUCLIDLP:func.5">plane_of_REAL</a> 2</div></div>
