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<b>let </b><font color="Maroon" title="c2">a</font>, <font color="Maroon" title="c3">c</font>, <font color="Maroon" title="c4">b</font>, <font color="Maroon" title="c5">d</font> be  <a href="xreal_0.html#V1" title="XREAL_0:attr.1">real</a>  <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a> ;<br/>







<b>assume </b><b>that </b><br/><a NAME="E1:112"/><i><font color="Green" title="E71">A1</font></i>: 
0 <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c2">a</font>
 <b>and </b><br/><a NAME="E2:112"/><i><font color="Green" title="E72">A2</font></i>: 
0 <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c3">c</font>
 <b>and </b><br/><a NAME="E3:112"/><i><font color="Green" title="E73">A3</font></i>: 
<font color="Maroon" title="c2">a</font> <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> <font color="Maroon" title="c4">b</font>
 <b>and </b><br/><a NAME="E4:112"/><i><font color="Green" title="E74">A4</font></i>: 
<font color="Maroon" title="c3">c</font> <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> <font color="Maroon" title="c5">d</font>
 ;<br/>

<a NAME="E5:112"/><i><font color="Green" title="E75">A5</font></i>: 
<font color="Maroon" title="c2">a</font> <a href="xcmplx_0.html#K3" title="XCMPLX_0:func.3">*</a> <font color="Maroon" title="c5">d</font> <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> <font color="Maroon" title="c4">b</font> <a href="xcmplx_0.html#K3" title="XCMPLX_0:func.3">*</a> <font color="Maroon" title="c5">d</font>
 
<b>by </b><i><a class="txt" href="xreal_1.html#E2:112"><i><font color="Green" title="E72">A2</font></i></a>, <a class="txt" href="xreal_1.html#E3:112"><i><font color="Green" title="E73">A3</font></i></a>, <a class="txt" href="xreal_1.html#E4:112"><i><font color="Green" title="E74">A4</font></i></a>, <a class="txt" href="xreal_1.html#E23"><i><font color="Green" title="E16">Lm16</font></i></a></i>;<br/>
<a NAME="E6:112"/>
<font color="Maroon" title="c2">a</font> <a href="xcmplx_0.html#K3" title="XCMPLX_0:func.3">*</a> <font color="Maroon" title="c3">c</font> <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c2">a</font> <a href="xcmplx_0.html#K3" title="XCMPLX_0:func.3">*</a> <font color="Maroon" title="c5">d</font>
 
<b>by </b><i><a class="txt" href="xreal_1.html#E1:112"><i><font color="Green" title="E71">A1</font></i></a>, <a class="txt" href="xreal_1.html#E4:112"><i><font color="Green" title="E74">A4</font></i></a>, <a class="txt" href="xreal_1.html#E22"><i><font color="Green" title="E15">Lm15</font></i></a></i>;<br/>
<b>hence </b><a NAME="E7:112"/>
<font color="Maroon" title="c2">a</font> <a href="xcmplx_0.html#K3" title="XCMPLX_0:func.3">*</a> <font color="Maroon" title="c3">c</font> <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> <font color="Maroon" title="c4">b</font> <a href="xcmplx_0.html#K3" title="XCMPLX_0:func.3">*</a> <font color="Maroon" title="c5">d</font>
 <b>by </b><i><a class="txt" href="xreal_1.html#E5:112"><i><font color="Green" title="E75">A5</font></i></a>, <a class="txt" href="xreal_1.html#E4"><i><font color="Green" title="E4">Lm4</font></i></a></i>;<br/>


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