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<b>let </b><font color="Maroon">f</font> be   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">T</font>,<font color="Maroon">D</font>;<br/>

<b>thus </b><a NAME="E1:44_1_1"/>
 <a href="relset_1.html#K4">dom</a> <font color="Maroon">f</font> is   <a href="trees_1.html#NM1">Tree</a>
 <b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="trees_2.html#D8">TREES_2:def 8</a><br/>


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