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<b>let </b><font color="Maroon">D1</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">D2</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">a1</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">D1</font>;<br/><b>let </b><font color="Maroon">b1</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">D1</font>;<br/><b>let </b><font color="Maroon">a2</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">D2</font>;<br/><b>let </b><font color="Maroon">b2</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">D2</font>;<br/><b>let </b><font color="Maroon">f1</font> be   <a href="binop_1.html#NM2">BinOp</a> of <font color="Maroon">D1</font>;<br/><b>let </b><font color="Maroon">f2</font> be   <a href="binop_1.html#NM2">BinOp</a> of <font color="Maroon">D2</font>;<br/>















<a NAME="E1:33"/>
( <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">a1</font>,<font color="Maroon">a2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">b1</font>,<font color="Maroon">b2</font></span><a href="domain_1.html#K1">]</a></span></span><a href="domain_1.html#K1">]</a></span> <a href="hidden.html#R2">in</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">D1</font>,<font color="Maroon">D2</font></span><a href="zfmisc_1.html#K2">:]</a></span>,<span class="p2"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">D1</font>,<font color="Maroon">D2</font></span><a href="zfmisc_1.html#K2">:]</a></span></span><a href="zfmisc_1.html#K2">:]</a></span> &amp; <font color="Maroon">f1</font> <a href="binop_1.html#K2">.</a> <font color="Maroon">a1</font>,<font color="Maroon">b1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f1</font> <a href="funct_2.html#K3">.</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">a1</font>,<font color="Maroon">b1</font></span><a href="domain_1.html#K1">]</a></span> &amp; <font color="Maroon">f2</font> <a href="binop_1.html#K2">.</a> <font color="Maroon">a2</font>,<font color="Maroon">b2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f2</font> <a href="funct_2.html#K3">.</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">a2</font>,<font color="Maroon">b2</font></span><a href="domain_1.html#K1">]</a></span> &amp; <span class="p1"><a href="filter_1.html#K6" target="_self">|:</a><span class="default"><font color="Maroon">f1</font>,<font color="Maroon">f2</font></span><a href="filter_1.html#K6" target="_self">:|</a></span> <a href="binop_1.html#K2">.</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">a1</font>,<font color="Maroon">a2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">b1</font>,<font color="Maroon">b2</font></span><a href="domain_1.html#K1">]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="filter_1.html#K6" target="_self">|:</a><span class="default"><font color="Maroon">f1</font>,<font color="Maroon">f2</font></span><a href="filter_1.html#K6" target="_self">:|</a></span> <a href="funct_2.html#K3">.</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">a1</font>,<font color="Maroon">a2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">b1</font>,<font color="Maroon">b2</font></span><a href="domain_1.html#K1">]</a></span></span><a href="domain_1.html#K1">]</a></span> &amp;  <a href="relat_1.html#K1">dom</a> <span class="p1"><a href="filter_1.html#K6" target="_self">|:</a><span class="default"><font color="Maroon">f1</font>,<font color="Maroon">f2</font></span><a href="filter_1.html#K6" target="_self">:|</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">D1</font>,<font color="Maroon">D2</font></span><a href="zfmisc_1.html#K2">:]</a></span>,<span class="p2"><a href="zfmisc_1.html#K2">[:</a><span class="default"><font color="Maroon">D1</font>,<font color="Maroon">D2</font></span><a href="zfmisc_1.html#K2">:]</a></span></span><a href="zfmisc_1.html#K2">:]</a></span> )
 
<b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<b>hence </b><a NAME="E2:33"/>
<span class="p1"><a href="filter_1.html#K6" target="_self">|:</a><span class="default"><font color="Maroon">f1</font>,<font color="Maroon">f2</font></span><a href="filter_1.html#K6" target="_self">:|</a></span> <a href="binop_1.html#K2">.</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">a1</font>,<font color="Maroon">a2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">b1</font>,<font color="Maroon">b2</font></span><a href="domain_1.html#K1">]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">f1</font> <a href="binop_1.html#K2">.</a> <font color="Maroon">a1</font>,<font color="Maroon">b1</font></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">f2</font> <a href="binop_1.html#K2">.</a> <font color="Maroon">a2</font>,<font color="Maroon">b2</font></span>)</span></span><a href="domain_1.html#K1">]</a></span>
 <b>by </b><i><a class="ref" href="funct_4.html#T58">FUNCT_4:58</a></i>;<br/>


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