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<b>assume </b><a NAME="E1:5_1_1"/>
<font color="Maroon">X</font> <a href="funcop_1.html#K2">--&gt;</a> <font color="Maroon">a</font> is <a href="finset_1.html#V1">finite</a>
 ;<br/>

<b>then reconsider </b><font color="Maroon">f</font> = <font color="Maroon">X</font> <a href="funcop_1.html#K2">--&gt;</a> <font color="Maroon">a</font> as  <a href="finset_1.html#V1">finite</a> <a href="relat_1.html#NM1">Relation</a> ;<br/>
<a NAME="E3:5_1_1"/>
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font> is <a href="finset_1.html#V1">finite</a>
 
;<br/>
<b>hence </b><a NAME="E4:5_1_1"/>
contradiction
 <b>by </b><i><a class="ref" href="funcop_1.html#T19">FUNCOP_1:19</a></i>;<br/>


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