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<b>let </b><font color="Maroon">r</font> be  <a href="xreal_0.html#V1">real</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="3_1"><b>now </b></a><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="3_1_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:3_1_1"/>
( 0 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">r</font> or <font color="Maroon">r</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 0 )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="3_1_1_1"><b>case </b></a><a NAME="E1:3_1_1_1"/><i><font color="Green">E30</font></i>: 
0 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">r</font>
 ;<br/><div class="add"><a NAME="E2:3_1_1_1"/><i><font color="Green">E31</font></i>: 
 <a href="rfunct_3.html#K2" target="_self">max+</a> <font color="Maroon">r</font> <a href="hidden.html#R1">=</a> <font color="Maroon">r</font>
 <b>by </b><i>, <a class="ref" href="xxreal_0.html#D9">XXREAL_0:def 9</a></i>;<br/><a NAME="E3:3_1_1_1"/><i><font color="Green">E32</font></i>: 
 <a href="xcmplx_0.html#K4">-</a> <font color="Maroon">r</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="real_1.html#K1">-</a> 0
 <b>by </b><i>, <a class="ref" href="xreal_1.html#T26">XREAL_1:26</a></i>;<br/><a NAME="E4:3_1_1_1"/>
 <a href="rfunct_3.html#K3" target="_self">max-</a> <font color="Maroon">r</font> <a href="hidden.html#R1">=</a> 0
 <b>by </b><i>, <a class="ref" href="xxreal_0.html#D9">XXREAL_0:def 9</a></i>;<br/><b>hence </b><a NAME="E5:3_1_1_1"/>
<font color="Maroon">r</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K2" target="_self">max+</a> <font color="Maroon">r</font></span>)</span> <a href="real_1.html#K5">-</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K3" target="_self">max-</a> <font color="Maroon">r</font></span>)</span>
 <b>by </b><i/>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="3_1_1_2"><b>case </b></a><a NAME="E1:3_1_1_2"/><i><font color="Green">E33</font></i>: 
<font color="Maroon">r</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 0
 ;<br/><div class="add"><a NAME="E2:3_1_1_2"/><i><font color="Green">E34</font></i>: 
 <a href="rfunct_3.html#K2" target="_self">max+</a> <font color="Maroon">r</font> <a href="hidden.html#R1">=</a> 0
 <b>by </b><i>, <a class="ref" href="xxreal_0.html#D9">XXREAL_0:def 9</a></i>;<br/><a NAME="E3:3_1_1_2"/><i><font color="Green">E35</font></i>: 
0 <a href="xxreal_0.html#NR3" target="_self">&lt;</a>  <a href="xcmplx_0.html#K4">-</a> <font color="Maroon">r</font>
 <b>by </b><i>, <a class="ref" href="xreal_1.html#T60">XREAL_1:60</a></i>;<br/><a NAME="E4:3_1_1_2"/><i><font color="Green">E36</font></i>: 
 <a href="rfunct_3.html#K3" target="_self">max-</a> <font color="Maroon">r</font> <a href="hidden.html#R1">=</a>  <a href="xcmplx_0.html#K4">-</a> <font color="Maroon">r</font>
 <b>by </b><i>, <a class="ref" href="xxreal_0.html#D9">XXREAL_0:def 9</a></i>;<br/><b>thus </b><a NAME="E5:3_1_1_2"/>
<font color="Maroon">r</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K2" target="_self">max+</a> <font color="Maroon">r</font></span>)</span> <a href="real_1.html#K5">-</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K3" target="_self">max-</a> <font color="Maroon">r</font></span>)</span>
 <b>by </b><i>, </i>;<br/></div><b>end;</b></div></div><b>end;</b></div></div><b>end;</b></div>
<b>hence </b><a NAME="E2:3"/>
<font color="Maroon">r</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K2" target="_self">max+</a> <font color="Maroon">r</font></span>)</span> <a href="real_1.html#K5">-</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K3" target="_self">max-</a> <font color="Maroon">r</font></span>)</span>
 ;<br/>


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