<?xml version="1.0"?>
<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E16">Th23</font></span>: <a NAME="T26"><span class="comment"><font color="firebrick">:: BKMODEL1:26</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">D</font> being   non  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>   <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a> <br/>  for <font color="Olive" title="b2">A</font> being   <a href="matrix_0.html#NM2" title="MATRIX_0:NM.2">Matrix</a> of 1,3,<font color="Olive" title="b1">D</font> holds  <font color="Olive" title="b2">A</font> <a href="matrix_0.html#K4" title="MATRIX_0:func.4">@</a>  is 3,1 <a href="matrix_0.html#V2" title="MATRIX_0:attr.2">-size</a> </div></div>
