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<b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">Y</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">f</font> be   <a href="funct_1.html#NM1">Function</a>;<br/>



<a NAME="E1:21"/>
( <span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="xboole_0.html#K2">\/</a> <font color="Maroon">Y</font></span>)</span> <a href="algspec1.html#K1" target="_self">-indexing</a> <font color="Maroon">f</font> <a href="pboole.html#R6">=</a> <span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="algspec1.html#K1" target="_self">-indexing</a> <font color="Maroon">f</font></span>)</span> <a href="circcomb.html#K1">+*</a> <span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="algspec1.html#K1" target="_self">-indexing</a> <font color="Maroon">f</font></span>)</span> &amp; <font color="Maroon">X</font> <a href="algspec1.html#K1" target="_self">-indexing</a> <font color="Maroon">f</font> <a href="partfun1.html#R1">tolerates</a> <font color="Maroon">Y</font> <a href="algspec1.html#K1" target="_self">-indexing</a> <font color="Maroon">f</font> )
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E2:21"/>
<span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="xboole_0.html#K2">\/</a> <font color="Maroon">Y</font></span>)</span> <a href="algspec1.html#K1" target="_self">-indexing</a> <font color="Maroon">f</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="algspec1.html#K1" target="_self">-indexing</a> <font color="Maroon">f</font></span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default"><font color="Maroon">Y</font> <a href="algspec1.html#K1" target="_self">-indexing</a> <font color="Maroon">f</font></span>)</span>
 <b>by </b><i><a class="ref" href="funct_4.html#T31">FUNCT_4:31</a></i>;<br/>


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