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<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">T1</font> be   <a href="trees_2.html#NM4">DecoratedTree</a>, <font color="Maroon">T2</font> be   <a href="trees_2.html#NM4">DecoratedTree</a>;<br/>



<a NAME="E1:25"/>
( <font color="Maroon">x</font> <a href="trees_4.html#K6" target="_self">-tree</a> <font color="Maroon">T1</font>,<font color="Maroon">T2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font> <a href="trees_4.html#K4" target="_self">-tree</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">T1</font>,<font color="Maroon">T2</font></span><a href="finseq_1.html#K10">*&gt;</a></span> &amp;  <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="trees_4.html#K4" target="_self">-tree</a> <span class="p2"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">T1</font>,<font color="Maroon">T2</font></span><a href="finseq_1.html#K10">*&gt;</a></span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="trees_3.html#K13">tree</a> <span class="p1">(<span class="default"><a href="funct_6.html#K2">doms</a> <span class="p2"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">T1</font>,<font color="Maroon">T2</font></span><a href="finseq_1.html#K10">*&gt;</a></span></span>)</span> &amp;  <a href="funct_6.html#K2">doms</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">T1</font>,<font color="Maroon">T2</font></span><a href="finseq_1.html#K10">*&gt;</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><span class="p2">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">T1</font></span>)</span>,<span class="p2">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">T2</font></span>)</span></span><a href="finseq_1.html#K10">*&gt;</a></span> )
 
<b>by </b><i>, <a class="ref" href="funct_6.html#T34">FUNCT_6:34</a></i>;<br/>
<b>hence </b><a NAME="E2:25"/>
 <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="trees_4.html#K6" target="_self">-tree</a> <font color="Maroon">T1</font>,<font color="Maroon">T2</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="trees_3.html#K15">tree</a> <span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">T1</font></span>)</span>,<span class="p1">(<span class="default"><a href="relat_1.html#K1">dom</a> <font color="Maroon">T2</font></span>)</span>
 <b>by </b><i><a class="ref" href="trees_3.html#D17">TREES_3:def 17</a></i>;<br/>


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