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<b>let </b><font color="Maroon">C</font> be   <a href="conlat_1.html#NM1">FormalContext</a>;<br/><b>let </b><font color="Maroon">CP1</font> be  <a href="conlat_1.html#V6" target="_self">strict</a> <a href="conlat_1.html#NM4">FormalConcept</a> of <font color="Maroon">C</font>, <font color="Maroon">CP2</font> be  <a href="conlat_1.html#V6" target="_self">strict</a> <a href="conlat_1.html#NM4">FormalConcept</a> of <font color="Maroon">C</font>;<br/>



<b>consider </b><font color="Maroon">O</font> being   <a href="subset_1.html#NM2">Subset</a> of the <a href="conlat_1.html#U1" target="_self">Objects</a> of <font color="Maroon">C</font>, <font color="Maroon">A</font> being   <a href="subset_1.html#NM2">Subset</a> of the <a href="conlat_1.html#U2" target="_self">Attributes</a> of <font color="Maroon">C</font><b> such that </b><br/><a NAME="E2:76"/><i><font color="Green">E29</font></i>: 
( <span class="p1">(<span class="default"><a href="conlat_1.html#K10" target="_self">B-join</a> <font color="Maroon">C</font></span>)</span> <a href="binop_1.html#K1">.</a> <font color="Maroon">CP1</font>,<font color="Maroon">CP2</font> <a href="hidden.html#R1">=</a>  <a href="conlat_1.html#G3" target="_self">ConceptStr</a>(# <font color="Maroon">O</font>,<font color="Maroon">A</font> #) &amp; <font color="Maroon">O</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="conlat_1.html#K2" target="_self">AttributeDerivation</a> <font color="Maroon">C</font></span>)</span> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="conlat_1.html#K1" target="_self">ObjectDerivation</a> <font color="Maroon">C</font></span>)</span> <a href="funct_2.html#K3">.</a> <span class="p2">(<span class="default">the <a href="conlat_1.html#U4" target="_self">Extent</a> of <font color="Maroon">CP1</font> <a href="subset_1.html#K4">\/</a> the <a href="conlat_1.html#U4" target="_self">Extent</a> of <font color="Maroon">CP2</font></span>)</span></span>)</span> &amp; <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> the <a href="conlat_1.html#U5" target="_self">Intent</a> of <font color="Maroon">CP1</font> <a href="subset_1.html#K9">/\</a> the <a href="conlat_1.html#U5" target="_self">Intent</a> of <font color="Maroon">CP2</font> )
 <b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">O'</font> being   <a href="subset_1.html#NM2">Subset</a> of the <a href="conlat_1.html#U1" target="_self">Objects</a> of <font color="Maroon">C</font>, <font color="Maroon">A'</font> being   <a href="subset_1.html#NM2">Subset</a> of the <a href="conlat_1.html#U2" target="_self">Attributes</a> of <font color="Maroon">C</font><b> such that </b><br/><a NAME="E4:76"/><i><font color="Green">E32</font></i>: 
( <span class="p1">(<span class="default"><a href="conlat_1.html#K10" target="_self">B-join</a> <font color="Maroon">C</font></span>)</span> <a href="binop_1.html#K1">.</a> <font color="Maroon">CP2</font>,<font color="Maroon">CP1</font> <a href="hidden.html#R1">=</a>  <a href="conlat_1.html#G3" target="_self">ConceptStr</a>(# <font color="Maroon">O'</font>,<font color="Maroon">A'</font> #) &amp; <font color="Maroon">O'</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="conlat_1.html#K2" target="_self">AttributeDerivation</a> <font color="Maroon">C</font></span>)</span> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="conlat_1.html#K1" target="_self">ObjectDerivation</a> <font color="Maroon">C</font></span>)</span> <a href="funct_2.html#K3">.</a> <span class="p2">(<span class="default">the <a href="conlat_1.html#U4" target="_self">Extent</a> of <font color="Maroon">CP2</font> <a href="subset_1.html#K4">\/</a> the <a href="conlat_1.html#U4" target="_self">Extent</a> of <font color="Maroon">CP1</font></span>)</span></span>)</span> &amp; <font color="Maroon">A'</font> <a href="hidden.html#R1">=</a> the <a href="conlat_1.html#U5" target="_self">Intent</a> of <font color="Maroon">CP2</font> <a href="subset_1.html#K9">/\</a> the <a href="conlat_1.html#U5" target="_self">Intent</a> of <font color="Maroon">CP1</font> )
 <b>by </b><i/>;<br/>
<b>thus </b><a NAME="E5:76"/>
<span class="p1">(<span class="default"><a href="conlat_1.html#K10" target="_self">B-join</a> <font color="Maroon">C</font></span>)</span> <a href="binop_1.html#K1">.</a> <font color="Maroon">CP1</font>,<font color="Maroon">CP2</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="conlat_1.html#K10" target="_self">B-join</a> <font color="Maroon">C</font></span>)</span> <a href="binop_1.html#K1">.</a> <font color="Maroon">CP2</font>,<font color="Maroon">CP1</font>
 <b>by </b><i>, </i>;<br/>


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