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<b>reconsider </b><font color="Maroon">E</font> =  <a href="xboole_0.html#K1">{}</a>  as    <a href="t_1topsp.html#M1" target="_self">Family-Class</a> of <font color="Maroon">X</font> <b>by </b><i/>;<br/>
<b>take </b>
<font color="Maroon">E</font>
;<br/>

<b>let </b><font color="Maroon">S</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="t_1topsp.html#D3" target="_self">T_1TOPSP:def 3</a><br/>

<b>assume </b><a NAME="E2:11_1_1"/>
<font color="Maroon">S</font> <a href="hidden.html#R2">in</a> <font color="Maroon">E</font>
 ;<br/>

<b>hence </b><a NAME="E3:11_1_1"/>
<font color="Maroon">S</font> is    <a href="eqrel_1.html#M1">a_partition</a> of <font color="Maroon">X</font>
 ;<br/>


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