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<b>let </b><font color="Maroon" title="c1">A</font> be   <a href="roughs_1.html#NM2" title="ROUGHS_1:NM.2">Tolerance_Space</a>;<br/><b>let </b><font color="Maroon" title="c2">X</font> be   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c1">A</font>;<br/>



<a NAME="E1:40"/>
( <font color="Maroon" title="c2">X</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="roughs_1.html#K3" title="ROUGHS_1:func.3">LAp</a> <font color="Maroon" title="c2">X</font> iff not <font color="Maroon" title="c2">X</font> is <a href="roughs_1.html#V4" title="ROUGHS_1:attr.4">rough</a> )
 
<b>by </b><i><a class="ref" href="roughs_1.html#T15" target="_self" title="ROUGHS_1:th.15">Th15</a></i>;<br/>
<b>hence </b><a NAME="E2:40"/>
( <font color="Maroon" title="c2">X</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="roughs_1.html#K3" title="ROUGHS_1:func.3">LAp</a> <font color="Maroon" title="c2">X</font> iff <font color="Maroon" title="c2">X</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="roughs_1.html#K4" title="ROUGHS_1:func.4">UAp</a> <font color="Maroon" title="c2">X</font> )
 <b>by </b><i><a class="ref" href="roughs_1.html#T16" target="_self" title="ROUGHS_1:th.16">Th16</a></i>;<br/>


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