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<b>let </b><font color="Maroon" title="c1">x1</font>, <font color="Maroon" title="c2">x2</font> be    <a href="subset_1.html#M2" title="SUBSET_1:mode.2">Element</a> of  <a href="eqrel_1.html#K8" title="EQREL_1:func.8">Class</a> <font color="Maroon">F<sub>2</sub></font>();<br/>

<b>consider </b><font color="Maroon" title="c3">y1</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> <b> such that </b><br/><a NAME="E2:10_1"/><i><font color="Green" title="E7">A2</font></i>: 
( <font color="Maroon" title="c3">y1</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon">F<sub>1</sub></font>() &amp; <font color="Maroon" title="c1">x1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="eqrel_1.html#K6" title="EQREL_1:func.6">Class</a> <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon" title="c3">y1</font> )
 <b>by </b><i><a class="ref" href="eqrel_1.html#D5" title="EQREL_1:def.5">EQREL_1:def 5</a></i>;<br/>
<b>consider </b><font color="Maroon" title="c4">y2</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> <b> such that </b><br/><a NAME="E4:10_1"/><i><font color="Green" title="E8">A3</font></i>: 
( <font color="Maroon" title="c4">y2</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon">F<sub>1</sub></font>() &amp; <font color="Maroon" title="c2">x2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="eqrel_1.html#K6" title="EQREL_1:func.6">Class</a> <font color="Maroon">F<sub>2</sub></font>(),<font color="Maroon" title="c4">y2</font> )
 <b>by </b><i><a class="ref" href="eqrel_1.html#D5" title="EQREL_1:def.5">EQREL_1:def 5</a></i>;<br/>
<b>reconsider </b><font color="Maroon" title="c5">y1</font> = <font color="Maroon" title="c3">y1</font>, <font color="Maroon" title="c6">y2</font> = <font color="Maroon" title="c4">y2</font> as    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of <font color="Maroon">F<sub>1</sub></font>() <b>by </b><i><a class="txt" href="filter_1.html#E2:10_1"><i><font color="Green" title="E7">A2</font></i></a>, <a class="txt" href="filter_1.html#E4:10_1"><i><font color="Green" title="E8">A3</font></i></a></i>;<br/>
<b>thus </b><a NAME="E6:10_1"/>
<font color="Maroon">P<sub>1</sub></font>[<font color="Maroon" title="c1">x1</font>,<font color="Maroon" title="c2">x2</font>]
 <b>by </b><i><a class="txt" href="filter_1.html#E1:10"><i><font color="Green" title="E6">A1</font></i></a>, <a class="txt" href="filter_1.html#E2:10_1"><i><font color="Green" title="E7">A2</font></i></a>, <a class="txt" href="filter_1.html#E4:10_1"><i><font color="Green" title="E8">A3</font></i></a></i>;<br/>


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