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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/>



<a NAME="E1:63"/>
( ( <font color="Maroon">c<sub>1</sub></font> is   <a href="trees_2.html#NM4">DecoratedTree</a> &amp; <font color="Maroon">c<sub>2</sub></font> is   <a href="trees_2.html#NM4">DecoratedTree</a> implies <span class="p1"><a href="tarski.html#K2">{</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span><a href="tarski.html#K2">}</a></span> is <a href="trees_3.html#V3" target="_self">constituted-DTrees</a> ) &amp; ( <span class="p1"><a href="tarski.html#K2">{</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span><a href="tarski.html#K2">}</a></span> is <a href="trees_3.html#V3" target="_self">constituted-DTrees</a> implies ( <font color="Maroon">c<sub>1</sub></font> is   <a href="trees_2.html#NM4">DecoratedTree</a> &amp; <font color="Maroon">c<sub>2</sub></font> is   <a href="trees_2.html#NM4">DecoratedTree</a> ) ) &amp;  <a href="relat_1.html#K2">rng</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span><a href="finseq_1.html#K10">*&gt;</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K2">{</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span><a href="tarski.html#K2">}</a></span> )
 
<b>by </b><i><a class="ref" href="trees_3.html#T18" target="_self">Th18</a>, <a class="ref" href="finseq_2.html#T147">FINSEQ_2:147</a></i>;<br/>
<b>hence </b><a NAME="E2:63"/>
( <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span><a href="finseq_1.html#K10">*&gt;</a></span> is <a href="trees_3.html#V6" target="_self">DTree-yielding</a> iff ( <font color="Maroon">c<sub>1</sub></font> is   <a href="trees_2.html#NM4">DecoratedTree</a> &amp; <font color="Maroon">c<sub>2</sub></font> is   <a href="trees_2.html#NM4">DecoratedTree</a> ) )
 <b>by </b><i><a class="ref" href="trees_3.html#D11" target="_self">Def11</a></i>;<br/>


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