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<b>let </b><font color="Maroon">X</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">f</font> be   <a href="partfun1.html#NM1">PartFunc</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">X</font>,<font color="Maroon">X</font></span><a href="zfmisc_1.html#K2">:]</a></span>, <a href="numbers.html#K1">REAL</a> ;<br/><b>let </b><font color="Maroon">a</font> be  non <a href="xxreal_0.html#V3">negative</a> <a href="xreal_0.html#V1">real</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>





<b>assume </b><a NAME="E1:36"/><i><font color="Green">E29</font></i>: 
(  <a href="taxonom1.html#K1" target="_self">low_toler</a> <font color="Maroon">f</font>,<font color="Maroon">a</font> <a href="relat_2.html#R1">is_reflexive_in</a> <font color="Maroon">X</font> &amp; <font color="Maroon">f</font> is <a href="metric_1.html#V4">symmetric</a> )
 ;<br/>

<b>reconsider </b><font color="Maroon">R</font> = <span class="p1">(<span class="default"><a href="taxonom1.html#K1" target="_self">low_toler</a> <font color="Maroon">f</font>,<font color="Maroon">a</font></span>)</span> <a href="lang1.html#K17">[*]</a>  as   <a href="eqrel_1.html#NM2">Equivalence_Relation</a> of <font color="Maroon">X</font> <b>by </b><i>, </i>;<br/>
<b>reconsider </b><font color="Maroon">x</font> =  <a href="eqrel_1.html#K9">Class</a> <font color="Maroon">R</font> as    <a href="hidden.html#M1">set</a>  ;<br/>
<a NAME="E4:36"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="taxonom1.html#K2" target="_self">fam_class</a> <font color="Maroon">f</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:36"/>
 <a href="taxonom1.html#K2" target="_self">fam_class</a> <font color="Maroon">f</font> is  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> 
 ;<br/>


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