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<a NAME="E1:100_1_1"/>
for <font color="Olive">t</font> being   <a href="trees_1.html#M1">Element</a> of <font color="Maroon">T</font>  holds <br/>( <font color="Olive">t</font> <a href="hidden.html#R2">in</a> <font color="Maroon">T</font> or  ex <font color="Olive">l</font> being   <a href="trees_3.html#M8" target="_self">Leaf</a> of <font color="Maroon">T</font> st <font color="Olive">l</font> <a href="trees_1.html#NR3" target="_self">is_a_proper_prefix_of</a> <font color="Olive">t</font> )
 
;<br/>
<a NAME="E2:100_1_1"/><b>then </b>
<font color="Maroon">T</font> is    <a href="trees_3.html#M9" target="_self">T-Substitution</a> of <font color="Maroon">T</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:100_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being   <a href="trees_3.html#M9" target="_self">T-Substitution</a> of <font color="Maroon">T</font> st <font color="Olive">b<sub>1</sub></font> is <a href="finset_1.html#V1">finite</a>
 ;<br/>


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