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<b>let </b><font color="Maroon">Y</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">z</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">Y</font>;<br/><b>let </b><font color="Maroon">PA</font> be    <a href="eqrel_1.html#M1">a_partition</a> of <font color="Maroon">Y</font>;<br/>





<a NAME="E1:4"/>
(  <a href="partit1.html#K6">%O</a> <font color="Maroon">Y</font> <a href="partit1.html#NR2" target="_self">'&gt;'</a> <font color="Maroon">PA</font> &amp; <font color="Maroon">PA</font> <a href="partit1.html#NR2" target="_self">'&gt;'</a>  <a href="partit1.html#NK6" target="_self">%I</a> <font color="Maroon">Y</font> )
 
<b>by </b><i><a class="ref" href="partit1.html#T36">PARTIT1:36</a></i>;<br/>
<b>hence </b><a NAME="E2:4"/>
(  <a href="bvfunc_1.html#K20">EqClass</a> <font color="Maroon">z</font>,<font color="Maroon">PA</font> <a href="tarski.html#R1">c=</a>  <a href="bvfunc_1.html#K20">EqClass</a> <font color="Maroon">z</font>,<span class="p1">(<span class="default"><a href="partit1.html#K6">%O</a> <font color="Maroon">Y</font></span>)</span> &amp;  <a href="bvfunc_1.html#K20">EqClass</a> <font color="Maroon">z</font>,<span class="p1">(<span class="default"><a href="partit1.html#NK6" target="_self">%I</a> <font color="Maroon">Y</font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="bvfunc_1.html#K20">EqClass</a> <font color="Maroon">z</font>,<font color="Maroon">PA</font> )
 <b>by </b><i/>;<br/>


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