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<b>let </b><font color="Maroon">a</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/>



<b>assume </b><a NAME="E1:57"/>
<font color="Maroon">a</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">X</font>
 ;<br/>

<a NAME="E2:57"/><b>then </b>
(  <a href="partfun1.html#K6">id</a> <font color="Maroon">a</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K16" target="_self">Toler_on_subsets</a> <font color="Maroon">X</font> &amp; <font color="Maroon">a</font> <a href="hidden.html#R2">in</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">X</font> &amp;  <a href="partfun1.html#K6">id</a> <font color="Maroon">a</font> is   <a href="eqrel_1.html#NM1">Tolerance</a> of <font color="Maroon">a</font> )
 
<b>by </b><i><a class="ref" href="coh_sp.html#T5" target="_self">Th5</a></i>;<br/>
<a NAME="E3:57"/><b>then </b>
<span class="p1"><a href="tarski.html#K4">[</a><span class="default"><span class="p2">(<span class="default"><a href="partfun1.html#K6">id</a> <font color="Maroon">a</font></span>)</span>,<font color="Maroon">a</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2"><a href="tarski.html#K4">[</a><span class="default"><font color="Olive">t</font>,<font color="Olive">Y</font></span><a href="tarski.html#K4">]</a></span> where <font color="Olive">t</font> is    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K16" target="_self">Toler_on_subsets</a> <font color="Maroon">X</font>, <font color="Olive">Y</font> is   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">X</font> : <font color="Olive">t</font> is   <a href="eqrel_1.html#NM1">Tolerance</a> of <font color="Olive">Y</font> </span>}</span> 
 
;<br/>
<b>hence </b><a NAME="E4:57"/>
<span class="p1"><a href="tarski.html#K4">[</a><span class="default"><span class="p2">(<span class="default"><a href="partfun1.html#K6">id</a> <font color="Maroon">a</font></span>)</span>,<font color="Maroon">a</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K17" target="_self">TOL</a> <font color="Maroon">X</font>
 ;<br/>


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