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<b>let </b><font color="Maroon">P</font> be    <a href="eqrel_1.html#M1" target="_self">a_partition</a> of <font color="Maroon">X</font>;<br/>

<b>assume </b><a NAME="E1:44_1_1"/><i><font color="Green">E38</font></i>: 
 <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R2">in</a> <font color="Maroon">P</font>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="setfam_1.html#D9">SETFAM_1:def 9</a><br/>

<a NAME="E2:44_1_1"/><b>then </b>
<font color="Maroon">X</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a> 
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:44_1_1"/>
contradiction
 <b>by </b><i>, </i>;<br/>


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