<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">x</font> be   <a href="supinf_1.html#NM3">R_eal</a>;<br/>

<b>assume </b><a NAME="E1:9"/><i><font color="Green">E24</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="supinf_1.html#K1">+infty</a> 
 ;<br/>

<a NAME="E2:9"/><b>then </b><i><font color="Green">E28</font></i>: 
 <a href="supinf_2.html#K3" target="_self">-</a> <font color="Maroon">x</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="supinf_1.html#K2">-infty</a> 
 
<b>by </b><i/>;<br/>
<b>thus </b><a NAME="E3:9"/>
<a href="supinf_1.html#K1">+infty</a>  <a href="supinf_2.html#K4" target="_self">-</a> <font color="Maroon">x</font> <a href="hidden.html#R1">=</a>  <a href="supinf_1.html#K1">+infty</a> 
 <b>by </b><i>, </i>;<br/>

<a NAME="E4:9"/>
 <a href="supinf_2.html#K3" target="_self">-</a> <a href="supinf_1.html#K1">+infty</a>  <a href="hidden.html#R1">=</a>  <a href="supinf_1.html#K2">-infty</a> 
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:9"/>
<font color="Maroon">x</font> <a href="supinf_2.html#K4" target="_self">-</a> <a href="supinf_1.html#K1">+infty</a>  <a href="hidden.html#R1">=</a>  <a href="supinf_1.html#K2">-infty</a> 
 <b>by </b><i>, </i>;<br/>


</div>
