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<b>deffunc </b><font color="Maroon">H<sub>1</sub></font>(   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">A</font>,   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">A</font>) <b>-&gt; </b>   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">A</font> = <font color="Maroon">a<sub>1</sub></font> <a href="setwiseo.html#K5" target="_self">\/</a> <font color="Maroon">a<sub>2</sub></font>;<br/>
<a NAME="E1:52_1_1"/>
 ex <font color="Olive">IT</font> being  <a href="binop_1.html#NM2">BinOp</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">A</font> st <br/>for <font color="Olive">x</font>, <font color="Olive">y</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">A</font> holds  <font color="Olive">IT</font> <a href="binop_1.html#K2">.</a> <font color="Olive">x</font>,<font color="Olive">y</font> <a href="hidden.html#R1">=</a> <font color="Maroon">H<sub>1</sub></font>(<font color="Olive">x</font>,<font color="Olive">y</font>)
 
<b>from </b><i><a class="ref" href="binop_1.html#S4">BINOP_1:sch 4</a>();<br/></i>
<b>hence </b><a NAME="E2:52_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being  <a href="binop_1.html#NM2">BinOp</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">A</font> st <br/>for <font color="Olive">x</font>, <font color="Olive">y</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">A</font> holds  <font color="Olive">b<sub>1</sub></font> <a href="binop_1.html#K2">.</a> <font color="Olive">x</font>,<font color="Olive">y</font> <a href="hidden.html#R1">=</a> <font color="Olive">x</font> <a href="setwiseo.html#K5" target="_self">\/</a> <font color="Olive">y</font>
 ;<br/>


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