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<a NAME="E1:3_1_1"/>
( ( for <font color="Olive">p</font> being  <a href="trees_4.html#NM1">Node</a> of <font color="Maroon">T1</font> holds  <font color="Maroon">T1</font> <a href="funct_1.html#K1">.</a> <font color="Olive">p</font> <a href="hidden.html#R1">=</a> <font color="Maroon">T2</font> <a href="funct_1.html#K1">.</a> <font color="Olive">p</font> ) &amp;  <a href="relat_1.html#K1">dom</a> <font color="Maroon">T1</font> <a href="hidden.html#R1">=</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">T2</font> implies for <font color="Olive">x</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">T1</font> holds <br/><font color="Maroon">T1</font> <a href="funct_1.html#K1">.</a> <font color="Olive">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">T2</font> <a href="funct_1.html#K1">.</a> <font color="Olive">x</font> )
 
;<br/>
<b>hence </b><a NAME="E2:3_1_1"/>
( <font color="Maroon">T1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">T2</font> iff (  <a href="relat_1.html#K1">dom</a> <font color="Maroon">T1</font> <a href="hidden.html#R1">=</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">T2</font> &amp; ( for <font color="Olive">p</font> being  <a href="trees_4.html#NM1">Node</a> of <font color="Maroon">T1</font> holds  <font color="Maroon">T1</font> <a href="funct_1.html#K1">.</a> <font color="Olive">p</font> <a href="hidden.html#R1">=</a> <font color="Maroon">T2</font> <a href="funct_1.html#K1">.</a> <font color="Olive">p</font> ) ) )
 <b>by </b><i><a class="ref" href="funct_1.html#T9">FUNCT_1:9</a></i>;<br/>


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