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<span class="kw">let </span><font color="Maroon" title="c1">x</font>, <font color="Maroon" title="c2">y</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> ( <span class="p1"><a href="finseq_1.html#K10" title="FINSEQ_1:func.10">&lt;*</a><span class="default"><font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c2">y</font></span><a href="finseq_1.html#K10" title="FINSEQ_1:func.10">*&gt;</a></span> is  <a href="trees_3.html#V6" title="TREES_3:attr.6">DTree-yielding</a>  iff ( <font color="Maroon" title="c1">x</font> is   <a href="trees_2.html#NM4" title="TREES_2:NM.4">DecoratedTree</a> &amp; <font color="Maroon" title="c2">y</font> is   <a href="trees_2.html#NM4" title="TREES_2:NM.4">DecoratedTree</a> ) )</span><br/>



<a NAME="E1:65"/><span class="lab"><font color="Green" title="E33">A1</font></span>: 
( ( <font color="Maroon" title="c1">x</font> is   <a href="trees_2.html#NM4" title="TREES_2:NM.4">DecoratedTree</a> &amp; <font color="Maroon" title="c2">y</font> is   <a href="trees_2.html#NM4" title="TREES_2:NM.4">DecoratedTree</a> ) iff <span class="p1"><a href="tarski.html#K2" title="TARSKI:func.2">{</a><span class="default"><font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c2">y</font></span><a href="tarski.html#K2" title="TARSKI:func.2">}</a></span> is  <a href="trees_3.html#V3" title="TREES_3:attr.3">constituted-DTrees</a>  )
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="trees_3.html#T18" target="_self" title="TREES_3:th.18">Th18</a></span>;<br/>
<a NAME="E2:65"/>
 <a href="relat_1.html#K2" title="RELAT_1:func.2">rng</a> <span class="p1"><a href="finseq_1.html#K10" title="FINSEQ_1:func.10">&lt;*</a><span class="default"><font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c2">y</font></span><a href="finseq_1.html#K10" title="FINSEQ_1:func.10">*&gt;</a></span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="tarski.html#K2" title="TARSKI:func.2">{</a><span class="default"><font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c2">y</font></span><a href="tarski.html#K2" title="TARSKI:func.2">}</a></span>
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_2.html#T147" title="FINSEQ_2:th.147">FINSEQ_2:147</a></span>;<br/>
<span class="kw">hence </span><a NAME="E3:65"/>
( <span class="p1"><a href="finseq_1.html#K10" title="FINSEQ_1:func.10">&lt;*</a><span class="default"><font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c2">y</font></span><a href="finseq_1.html#K10" title="FINSEQ_1:func.10">*&gt;</a></span> is  <a href="trees_3.html#V6" title="TREES_3:attr.6">DTree-yielding</a>  iff ( <font color="Maroon" title="c1">x</font> is   <a href="trees_2.html#NM4" title="TREES_2:NM.4">DecoratedTree</a> &amp; <font color="Maroon" title="c2">y</font> is   <a href="trees_2.html#NM4" title="TREES_2:NM.4">DecoratedTree</a> ) )
 <span class="kw">by</span> <span class="lab"><a class="txt" href="#E1:65"><span class="lab"><font color="Green" title="E33">A1</font></span></a>, <a class="ref" href="trees_3.html#D11" target="_self" title="TREES_3:def.11">Def11</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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