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<b>set </b><font color="Maroon" title="c2">F</font> = <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><a href="coh_sp.html#K15" title="COH_SP:func.15">Toler</a> <font color="Olive" title="b1">Y</font></span>)</span> where <font color="Olive" title="b1">Y</font> is   <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <font color="Maroon" title="c1">X</font> : verum </span>}</span> ;<br/>
<a NAME="E1:49_1_1"/>
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c1">X</font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T2" title="XBOOLE_1:th.2">XBOOLE_1:2</a></i>;<br/>
<a NAME="E2:49_1_1"/><b>then </b>
(  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="coh_sp.html#K15" title="COH_SP:func.15">Toler</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  &amp;  <a href="coh_sp.html#K15" title="COH_SP:func.15">Toler</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><a href="coh_sp.html#K15" title="COH_SP:func.15">Toler</a> <font color="Olive" title="b1">Y</font></span>)</span> where <font color="Olive" title="b1">Y</font> is   <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <font color="Maroon" title="c1">X</font> : verum </span>}</span>  )
 
<b>by </b><i><a class="ref" href="coh_sp.html#D19" target="_self" title="COH_SP:def.19">Def19</a>, <a class="ref" href="toler_1.html#T39" title="TOLER_1:th.39">TOLER_1:39</a></i>;<br/>
<b>hence </b><a NAME="E3:49_1_1"/>
not  <a href="coh_sp.html#K16" title="COH_SP:func.16">Toler_on_subsets</a> <font color="Maroon" title="c1">X</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 <b>by </b><i><a class="ref" href="tarski.html#D4" title="TARSKI:def.4">TARSKI:def 4</a></i>;<br/>


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