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<b>let </b><font color="Maroon">A</font> be  non <a href="xboole_0.html#V1">empty</a> <a href="finset_1.html#V1">finite</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">PA1</font> be    <a href="eqrel_1.html#M1">a_partition</a> of <font color="Maroon">A</font>;<br/><b>let </b><font color="Maroon">PA2</font> be    <a href="eqrel_1.html#M1">a_partition</a> of <font color="Maroon">A</font>;<br/>





<b>assume </b><a NAME="E1:10"/><i><font color="Green">E22</font></i>: 
<font color="Maroon">PA1</font> <a href="setfam_1.html#R1">is_finer_than</a> <font color="Maroon">PA2</font>
 ;<br/>

<b>consider </b><font color="Maroon">E1</font> being   <a href="eqrel_1.html#NM2">Equivalence_Relation</a> of <font color="Maroon">A</font><b> such that </b><br/><a NAME="E3:10"/><i><font color="Green">E23</font></i>: 
<font color="Maroon">PA1</font> <a href="hidden.html#R1">=</a>  <a href="eqrel_1.html#K9">Class</a> <font color="Maroon">E1</font>
 <b>by </b><i><a class="ref" href="eqrel_1.html#T43">EQREL_1:43</a></i>;<br/>
<b>consider </b><font color="Maroon">E2</font> being   <a href="eqrel_1.html#NM2">Equivalence_Relation</a> of <font color="Maroon">A</font><b> such that </b><br/><a NAME="E5:10"/><i><font color="Green">E38</font></i>: 
<font color="Maroon">PA2</font> <a href="hidden.html#R1">=</a>  <a href="eqrel_1.html#K9">Class</a> <font color="Maroon">E2</font>
 <b>by </b><i><a class="ref" href="eqrel_1.html#T43">EQREL_1:43</a></i>;<br/>
<b>let </b><font color="Maroon">p2</font> be    <a href="subset_1.html#M2">Element</a> of <font color="Maroon">PA2</font>;<br/>

<b>reconsider </b><font color="Maroon">p2'</font> = <font color="Maroon">p2</font> as   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">A</font> ;<br/>
<b>consider </b><font color="Maroon">a</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E8:10"/><i><font color="Green">E39</font></i>: 
( <font color="Maroon">a</font> <a href="hidden.html#R2">in</a> <font color="Maroon">A</font> &amp; <font color="Maroon">p2'</font> <a href="hidden.html#R1">=</a>  <a href="eqrel_1.html#K7">Class</a> <font color="Maroon">E2</font>,<font color="Maroon">a</font> )
 <b>by </b><i>, <a class="ref" href="eqrel_1.html#D5">EQREL_1:def 5</a></i>;<br/>
<b>reconsider </b><font color="Maroon">E1a</font> =  <a href="eqrel_1.html#K7">Class</a> <font color="Maroon">E1</font>,<font color="Maroon">a</font> as    <a href="subset_1.html#M2">Element</a> of <font color="Maroon">PA1</font> <b>by </b><i>, , <a class="ref" href="eqrel_1.html#D5">EQREL_1:def 5</a></i>;<br/>
<b>take </b>
<font color="Maroon">E1a</font>
;<br/>

<b>consider </b><font color="Maroon">p22</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E11:10"/><i><font color="Green">E40</font></i>: 
( <font color="Maroon">p22</font> <a href="hidden.html#R2">in</a> <font color="Maroon">PA2</font> &amp; <font color="Maroon">E1a</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">p22</font> )
 <b>by </b><i>, <a class="ref" href="setfam_1.html#D2">SETFAM_1:def 2</a></i>;<br/>
<b>reconsider </b><font color="Maroon">p22'</font> = <font color="Maroon">p22</font> as   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">A</font> <b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">b</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E14:10"/><i><font color="Green">E42</font></i>: 
( <font color="Maroon">b</font> <a href="hidden.html#R2">in</a> <font color="Maroon">A</font> &amp; <font color="Maroon">p22'</font> <a href="hidden.html#R1">=</a>  <a href="eqrel_1.html#K7">Class</a> <font color="Maroon">E2</font>,<font color="Maroon">b</font> )
 <b>by </b><i>, , <a class="ref" href="eqrel_1.html#D5">EQREL_1:def 5</a></i>;<br/>
<a NAME="E15:10"/>
<font color="Maroon">a</font> <a href="hidden.html#R2">in</a>  <a href="eqrel_1.html#K7">Class</a> <font color="Maroon">E1</font>,<font color="Maroon">a</font>
 
<b>by </b><i>, <a class="ref" href="eqrel_1.html#T28">EQREL_1:28</a></i>;<br/>
<b>hence </b><a NAME="E16:10"/>
<font color="Maroon">E1a</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">p2</font>
 <b>by </b><i>, , , <a class="ref" href="eqrel_1.html#T31">EQREL_1:31</a></i>;<br/>


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