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<b>let </b><font color="Maroon" title="c1">T</font> be  <a href="trees_9.html#V4" title="TREES_9:attr.4">finite-branching</a> <a href="trees_2.html#NM4" title="TREES_2:NM.4">DecoratedTree</a>;<br/><b>let </b><font color="Maroon" title="c2">t</font> be    <a href="trees_1.html#M1" title="TREES_1:mode.1">Element</a> of  <a href="relat_1.html#NK2" title="RELAT_1:NK.2">dom</a> <font color="Maroon" title="c1">T</font>;<br/>



<b>consider </b><font color="Maroon" title="c3">q</font> being    <a href="trees_1.html#M1" title="TREES_1:mode.1">Element</a> of  <a href="relat_1.html#NK2" title="RELAT_1:NK.2">dom</a> <font color="Maroon" title="c1">T</font><b> such that </b><br/><a NAME="E2:6"/><i><font color="Green" title="E6">A1</font></i>: 
( <font color="Maroon" title="c3">q</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">t</font> &amp;  <a href="trees_9.html#K2" title="TREES_9:func.2">succ</a> <font color="Maroon" title="c1">T</font>,<font color="Maroon" title="c2">t</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">T</font> <a href="funct_1.html#NK3" title="FUNCT_1:NK.3">*</a> <span class="p1">(<span class="default"><font color="Maroon" title="c3">q</font> <a href="trees_9.html#K1" title="TREES_9:func.1">succ</a> </span>)</span> )
 <b>by </b><i><a class="ref" href="trees_9.html#D6" title="TREES_9:def.6">TREES_9:def 6</a></i>;<br/>
<b>thus </b><a NAME="E3:6"/>
 <a href="trees_9.html#K2" title="TREES_9:func.2">succ</a> <font color="Maroon" title="c1">T</font>,<font color="Maroon" title="c2">t</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">T</font> <a href="funct_1.html#NK3" title="FUNCT_1:NK.3">*</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">t</font> <a href="trees_9.html#K1" title="TREES_9:func.1">succ</a> </span>)</span>
 <b>by </b><i><a class="txt" href="qc_lang4.html#E2:6"><i><font color="Green" title="E6">A1</font></i></a></i>;<br/>


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