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<b>let </b><font color="Maroon">p</font> be    <a href="finseq_1.html#M2">FinSequence</a> of <font color="Maroon">D</font>;<br/><b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="trees_3.html#D3" target="_self">TREES_3:def 3</a>,<a class="ref" href="trees_3.html#D9" target="_self">TREES_3:def 9</a><br/>



<a NAME="E1:70_1_1"/>
 <a href="relset_1.html#K5">rng</a> <font color="Maroon">p</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">D</font>
 
;<br/>
<b>hence </b><a NAME="E2:70_1_1"/>
( <font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <font color="Maroon">p</font> implies <font color="Maroon">x</font> is   <a href="trees_1.html#NM1">Tree</a> )
 <b>by </b><i/>;<br/>


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