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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E68">Th69</font></span>: <a NAME="T69"><span class="comment"><font color="firebrick">:: INTERVA1:69</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">X</font> being   <a href="roughs_1.html#NM2" title="ROUGHS_1:NM.2">Tolerance_Space</a><br/>  for <font color="Olive" title="b2">A</font> being    <a href="interva1.html#M2" title="INTERVA1:mode.2">RoughSet</a> of <font color="Olive" title="b1">X</font> holds  <span class="p1">(<span class="default"><a href="interva1.html#K22" title="INTERVA1:func.22">ERS</a> <font color="Olive" title="b1">X</font></span>)</span> <a href="interva1.html#K16" title="INTERVA1:func.16">_\/_</a> <font color="Olive" title="b2">A</font> <a href="interva1.html#R2" title="INTERVA1:pred.2">=</a> <font color="Olive" title="b2">A</font> ;<br/></div></div>
