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<b>let </b><font color="Maroon">a</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="29_1"><b>now </b></a><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="29_1_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:29_1_1"/>
( <font color="Maroon">a</font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0 or <font color="Maroon">a</font> <a href="hidden.html#R1">=</a> 0 or <font color="Maroon">a</font> <a href="xxreal_0.html#R1">&lt;</a> 0 )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="29_1_1_1"><b>suppose </b></a><a NAME="E1:29_1_1_1"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">a</font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0
 ;<br/><div class="add"><a NAME="E2:29_1_1_1"/><b>then </b>
<font color="Maroon">a</font> <a href="prepower.html#K12">#R</a> 1 <a href="hidden.html#R1">=</a> <font color="Maroon">a</font>
 <b>by </b><i><a class="ref" href="prepower.html#T86">PREPOWER:86</a></i>;<br/><b>hence </b><a NAME="E3:29_1_1_1"/>
<font color="Maroon">a</font> <a href="power.html#K3" target="_self">to_power</a> 1 <a href="hidden.html#R1">=</a> <font color="Maroon">a</font>
 <b>by </b><i>, </i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="29_1_1_2"><b>suppose </b></a><a NAME="E1:29_1_1_2"/>
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> 0
 ;<br/><div class="add"><b>hence </b><a NAME="E2:29_1_1_2"/>
<font color="Maroon">a</font> <a href="power.html#K3" target="_self">to_power</a> 1 <a href="hidden.html#R1">=</a> <font color="Maroon">a</font>
 <b>by </b><i/>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="29_1_1_3"><b>suppose </b></a><a NAME="E1:29_1_1_3"/><i><font color="Green">E34</font></i>: 
<font color="Maroon">a</font> <a href="xxreal_0.html#R1">&lt;</a> 0
 ;<br/><div class="add"><b>reconsider </b><font color="Maroon">k</font> = 1 as   <a href="int_1.html#NM1">Integer</a> ;<br/><b>thus </b><font color="Maroon">a</font> <a href="power.html#K3" target="_self">to_power</a> 1 = 
<font color="Maroon">a</font> <a href="prepower.html#K6">#Z</a> <font color="Maroon">k</font>
<b>by </b><i>, </i>
<br/>.= 
<font color="Maroon">a</font>
<b>by </b><i><a class="ref" href="prepower.html#T45">PREPOWER:45</a></i>
;<br/></div><b>end;</b></div></div><b>end;</b></div></div><b>end;</b></div>
<b>hence </b><a NAME="E2:29"/>
<font color="Maroon">a</font> <a href="power.html#K3" target="_self">to_power</a> 1 <a href="hidden.html#R1">=</a> <font color="Maroon">a</font>
 ;<br/>


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