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<b>let </b><font color="Maroon">x</font> be    <a href="trees_3.html#M3">Element</a> of  <a href="trees_9.html#K3" target="_self">Subtrees</a> <font color="Maroon">t</font>;<br/>

<a NAME="E1:39_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">t</font> <a href="trees_2.html#K5">|</a> <font color="Olive">p</font></span>)</span> where <font color="Olive">p</font> is   <a href="trees_4.html#NM1">Node</a> of <font color="Maroon">t</font> : verum </span>}</span> 
 
;<br/>
<a NAME="E2:39_1_1"/><b>then </b>
 ex <font color="Olive">p</font> being  <a href="trees_4.html#NM1">Node</a> of <font color="Maroon">t</font> st <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">t</font> <a href="trees_2.html#K5">|</a> <font color="Olive">p</font>
 
;<br/>
<b>hence </b><a NAME="E3:39_1_1"/>
<font color="Maroon">x</font> is <a href="finset_1.html#V1">finite</a>
 ;<br/>


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