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<b>consider </b><font color="Maroon">d</font> being    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">D</font>;<br/>
<b>take </b>
 <a href="trees_4.html#K2">root-tree</a> <font color="Maroon">d</font>
;<br/>

<b>thus </b><a NAME="E2:4_1_1"/>
 <a href="trees_4.html#K2">root-tree</a> <font color="Maroon">d</font> is <a href="finset_1.html#V1">finite</a>
 ;<br/>


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