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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E51">Th55</font></span>: <a NAME="T55"><span class="comment"><font color="firebrick">:: INTERVA1:55</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>  ex <font color="Olive" title="b3">B</font>, <font color="Olive" title="b4">C</font> being   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Olive" title="b1">X</font> st <font color="Olive" title="b2">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="tarski.html#K4" title="TARSKI:func.4">[</a><span class="default"><font color="Olive" title="b3">B</font>,<font color="Olive" title="b4">C</font></span><a href="tarski.html#K4" title="TARSKI:func.4">]</a></span></div></div>
