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<b>let </b><font color="Maroon">c<sub>1</sub></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">c<sub>2</sub></font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be    <a href="eqrel_1.html#M1">a_partition</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>





<a NAME="E1:3"/>
<font color="Maroon">c<sub>3</sub></font> <a href="partit1.html#NR2" target="_self">'&gt;'</a> <font color="Maroon">c<sub>3</sub></font> <a href="partit1.html#K2">'/\'</a> <font color="Maroon">c<sub>4</sub></font>
 
<b>by </b><i><a class="ref" href="partit1.html#T17">PARTIT1:17</a></i>;<br/>
<b>hence </b><a NAME="E2:3"/>
 <a href="bvfunc_1.html#K22">EqClass</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="partit1.html#K2">'/\'</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="bvfunc_1.html#K22">EqClass</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="ref" href="bvfunc11.html#T1" target="_self">Th1</a></i>;<br/>


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