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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>, <font color="Maroon" title="c3">Y</font>, <font color="Maroon" title="c4">Z</font> be   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c1">A</font>;<br/>







<b>assume </b><a NAME="E1:94"/>
( <font color="Maroon" title="c2">X</font> <a href="roughs_1.html#R3" title="ROUGHS_1:pred.3">_c=^</a> <font color="Maroon" title="c3">Y</font> &amp; <font color="Maroon" title="c3">Y</font> <a href="roughs_1.html#R3" title="ROUGHS_1:pred.3">_c=^</a> <font color="Maroon" title="c4">Z</font> )
 ;<br/>

<a NAME="E2:94"/><b>then </b>
( <font color="Maroon" title="c2">X</font> <a href="roughs_1.html#R1" title="ROUGHS_1:pred.1">_c=</a> <font color="Maroon" title="c3">Y</font> &amp; <font color="Maroon" title="c3">Y</font> <a href="roughs_1.html#R1" title="ROUGHS_1:pred.1">_c=</a> <font color="Maroon" title="c4">Z</font> &amp; <font color="Maroon" title="c2">X</font> <a href="roughs_1.html#R2" title="ROUGHS_1:pred.2">c=^</a> <font color="Maroon" title="c3">Y</font> &amp; <font color="Maroon" title="c3">Y</font> <a href="roughs_1.html#R2" title="ROUGHS_1:pred.2">c=^</a> <font color="Maroon" title="c4">Z</font> )
 
<b>by </b><i><a class="ref" href="roughs_1.html#D13" target="_self" title="ROUGHS_1:def.13">Def13</a></i>;<br/>
<a NAME="E3:94"/><b>then </b>
( <font color="Maroon" title="c2">X</font> <a href="roughs_1.html#R1" title="ROUGHS_1:pred.1">_c=</a> <font color="Maroon" title="c4">Z</font> &amp; <font color="Maroon" title="c2">X</font> <a href="roughs_1.html#R2" title="ROUGHS_1:pred.2">c=^</a> <font color="Maroon" title="c4">Z</font> )
 
<b>by </b><i><a class="ref" href="roughs_1.html#T59" target="_self" title="ROUGHS_1:th.59">Th59</a>, <a class="ref" href="roughs_1.html#T60" target="_self" title="ROUGHS_1:th.60">Th60</a></i>;<br/>
<b>hence </b><a NAME="E4:94"/>
<font color="Maroon" title="c2">X</font> <a href="roughs_1.html#R3" title="ROUGHS_1:pred.3">_c=^</a> <font color="Maroon" title="c4">Z</font>
 <b>by </b><i><a class="ref" href="roughs_1.html#D13" target="_self" title="ROUGHS_1:def.13">Def13</a></i>;<br/>


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