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<b>let </b><font color="Maroon">A</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> , <font color="Maroon">B</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">F</font> be   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">B</font>,<font color="Maroon">A</font>, <font color="Maroon">G</font> be   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">B</font>,<font color="Maroon">A</font>;<br/><b>let </b><font color="Maroon">I</font> be    <a href="index_1.html#M3" target="_self">Indexing</a> of <font color="Maroon">F</font>,<font color="Maroon">G</font>;<br/><b>let </b><font color="Maroon">m</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">B</font>;<br/>







<b>reconsider </b><font color="Maroon">H</font> = <font color="Maroon">I</font> <a href="index_1.html#K9" target="_self">`2</a>  as    <a href="index_1.html#M2" target="_self">ManySortedFunctor</a> of <span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="pboole.html#K7">*</a> <font color="Maroon">F</font>,<span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="pboole.html#K7">*</a> <font color="Maroon">G</font> <b>by </b><i/>;<br/>
<a NAME="E2:32"/><i><font color="Green">E23</font></i>: 
<font color="Maroon">H</font> <a href="index_1.html#K13" target="_self">.</a> <font color="Maroon">m</font> is    <a href="cat_1.html#M2">Functor</a> of <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="pboole.html#K7">*</a> <font color="Maroon">F</font></span>)</span> <a href="index_1.html#K2" target="_self">.</a> <font color="Maroon">m</font>,<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="pboole.html#K7">*</a> <font color="Maroon">G</font></span>)</span> <a href="index_1.html#K2" target="_self">.</a> <font color="Maroon">m</font>
 
;<br/>
<a NAME="E3:32"/>
(  <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="pboole.html#K7">*</a> <font color="Maroon">F</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">B</font> &amp;  <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="pboole.html#K7">*</a> <font color="Maroon">G</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">B</font> )
 
<b>by </b><i><a class="ref" href="pboole.html#D3">PBOOLE:def 3</a></i>;<br/>
<a NAME="E4:32"/><b>then </b>
( <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="pboole.html#K7">*</a> <font color="Maroon">F</font></span>)</span> <a href="index_1.html#K2" target="_self">.</a> <font color="Maroon">m</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="index_1.html#K2" target="_self">.</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">m</font></span>)</span> &amp; <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="pboole.html#K7">*</a> <font color="Maroon">G</font></span>)</span> <a href="index_1.html#K2" target="_self">.</a> <font color="Maroon">m</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="index_1.html#K2" target="_self">.</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">m</font></span>)</span> )
 
<b>by </b><i><a class="ref" href="funct_1.html#T22">FUNCT_1:22</a></i>;<br/>
<b>hence </b><a NAME="E5:32"/>
<span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K9" target="_self">`2</a> </span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">m</font> is    <a href="cat_1.html#M2">Functor</a> of <span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="index_1.html#K2" target="_self">.</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">m</font></span>)</span>,<span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="index_1.html#K10" target="_self">`1</a> </span>)</span> <a href="index_1.html#K2" target="_self">.</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">m</font></span>)</span>
 <b>by </b><i/>;<br/>


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