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<b>let </b><font color="Maroon">D</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>

<a NAME="E1:1"/>
 <a href="trees_3.html#K5">FinTrees</a> <font color="Maroon">D</font> is  non <a href="xboole_0.html#V1">empty</a> <a href="subset_1.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="trees_3.html#K4">Trees</a> <font color="Maroon">D</font></span>)</span>
 
<b>by </b><i><a class="ref" href="trees_3.html#T22">TREES_3:22</a></i>;<br/>
<b>hence </b><a NAME="E2:1"/>
for <font color="Olive">p</font> being   <a href="finseq_1.html#M2">FinSequence</a> of  <a href="trees_3.html#K5">FinTrees</a> <font color="Maroon">D</font> holds  <font color="Olive">p</font> is    <a href="finseq_1.html#M2">FinSequence</a> of  <a href="trees_3.html#K4">Trees</a> <font color="Maroon">D</font>
 <b>by </b><i><a class="ref" href="finseq_2.html#T27">FINSEQ_2:27</a></i>;<br/>


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