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<b>let </b><font color="Maroon">F</font> be   <a href="funct_1.html#NM1">Function</a>, <font color="Maroon">f</font> be   <a href="funct_1.html#NM1">Function</a>;<br/>

<a NAME="E1:3"/>
( <font color="Maroon">F</font> <a href="funcop_1.html#K3">.:</a> <a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">f</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> <a href="funct_1.html#NK3" target="_self">*</a> <a href="xboole_0.html#K1">{}</a>  &amp; <font color="Maroon">F</font> <a href="funcop_1.html#K3">.:</a> <font color="Maroon">f</font>,<a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> <a href="funct_1.html#NK3" target="_self">*</a> <a href="xboole_0.html#K1">{}</a>  )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:3"/>
( <font color="Maroon">F</font> <a href="funcop_1.html#K3">.:</a> <a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">f</font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  &amp; <font color="Maroon">F</font> <a href="funcop_1.html#K3">.:</a> <font color="Maroon">f</font>,<a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  )
 ;<br/>


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