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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="struct_0.html#V3">empty</a> <a href="oposet_1.html#V3">Dneg</a>  <a href="oposet_1.html#L1">OrthoRelStr</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>



<b>consider </b><font color="Maroon">c<sub>3</sub></font> being   <a href="struct_0.html#NM7">Function</a> of <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>1</sub></font><b> such that </b><br/><a NAME="E2:11"/><i><font color="Green">E10</font></i>: 
( <font color="Maroon">c<sub>3</sub></font> <a href="funct_2.html#R2">=</a> the <a href="robbins1.html#U1">Compl</a> of <font color="Maroon">c<sub>1</sub></font> &amp; <font color="Maroon">c<sub>3</sub></font> is <a href="oposet_1.html#V2">dneg</a> )
 <b>by </b><i><a class="ref" href="oposet_1.html#D6">OPOSET_1:def 6</a></i>;<br/>
<a NAME="E3:11"/><i><font color="Green">E11</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="funct_2.html#K3">.</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>2</sub></font> <a href="robbins1.html#K3">`</a> 
 
<b>by </b><i><a class="txt" href="robbins3.html#E2:11"><i><font color="Green">E10</font></i></a>, <a class="ref" href="robbins1.html#D3">ROBBINS1:def 3</a></i>;<br/>
<a NAME="E4:11"/>
<font color="Maroon">c<sub>3</sub></font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="funct_2.html#K3">.</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="txt" href="robbins3.html#E2:11"><i><font color="Green">E10</font></i></a>, <a class="ref" href="oposet_1.html#D3">OPOSET_1:def 3</a></i>;<br/>
<b>hence </b><a NAME="E5:11"/>
<span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="robbins1.html#K3">`</a> </span>)</span> <a href="robbins1.html#K3">`</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="txt" href="robbins3.html#E2:11"><i><font color="Green">E10</font></i></a>, <a class="txt" href="robbins3.html#E3:11"><i><font color="Green">E11</font></i></a>, <a class="ref" href="robbins1.html#D3">ROBBINS1:def 3</a></i>;<br/>


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