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

<b>assume </b><a NAME="E1:1"/>
( <font color="Maroon">x</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="supinf_1.html#K1">+infty</a>  &amp; <font color="Maroon">x</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="supinf_1.html#K2">-infty</a>  )
 ;<br/>

<b>then reconsider </b><font color="Maroon">a</font> = <font color="Maroon">x</font> as   <a href="real_1.html#NM1">Real</a> <b>by </b><i><a class="ref" href="extreal1.html#T1">EXTREAL1:1</a></i>;<br/>
<b>reconsider </b><font color="Maroon">b</font> =  <a href="real_1.html#K1">-</a> <font color="Maroon">a</font> as   <a href="real_1.html#NM1">Real</a> ;<br/>
<a NAME="E4:1"/><i><font color="Green">E18</font></i>: 
<font color="Maroon">a</font> <a href="real_1.html#K3">+</a> <font color="Maroon">b</font> <a href="hidden.html#R1">=</a> 0
 
;<br/>
<a NAME="E5:1"/><i><font color="Green">E19</font></i>: 
 <a href="measure6.html#K1">R_EAL</a> <font color="Maroon">b</font> <a href="hidden.html#R1">=</a> <font color="Maroon">b</font>
 
<b>by </b><i><a class="ref" href="measure6.html#D1">MEASURE6:def 1</a></i>;<br/>
<b>take </b>
 <a href="measure6.html#K1">R_EAL</a> <font color="Maroon">b</font>
;<br/>

<b>thus </b><a NAME="E6:1"/>
<font color="Maroon">x</font> <a href="supinf_2.html#K2">+</a> <span class="p1">(<span class="default"><a href="measure6.html#K1">R_EAL</a> <font color="Maroon">b</font></span>)</span> <a href="hidden.html#R1">=</a> 0
 <b>by </b><i>, , <a class="ref" href="supinf_2.html#T1">SUPINF_2:1</a></i>;<br/>


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