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<b>take </b><font color="Maroon">f</font> =  <a href="xboole_0.html#K1">{}</a> ;<br/>

<a NAME="E1:7_1_1"/><i><font color="Green">E31</font></i>: 
for <font color="Olive">x</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="xboole_0.html#K1">{}</a>  holds <br/><font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> <font color="Olive">x</font> <a href="hidden.html#R1">=</a> 0
 
;<br/>
<a NAME="E2:7_1_1"/>
 <a href="finseq_1.html#K4">dom</a> <font color="Maroon">f</font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a> 
 
;<br/>
<b>hence </b><a NAME="E3:7_1_1"/>
( <font color="Maroon">f</font> is <a href="finset_1.html#V1">finite</a> &amp; <font color="Maroon">f</font> is <a href="ordinal1.html#V5">T-Sequence-like</a> )
 <b>by </b><i>, </i>;<br/>


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