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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/>

<b>assume </b><a NAME="E1:57"/><i><font color="Green">E31</font></i>: 
( <font color="Maroon">a</font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0 &amp; <font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 1 )
 ;<br/>

<a NAME="E2:57"/>
<font color="Maroon">a</font> <a href="power.html#K3" target="_self">to_power</a> 0 <a href="hidden.html#R1">=</a> 1
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:57"/>
 <a href="power.html#K5" target="_self">log</a> <font color="Maroon">a</font>,1 <a href="hidden.html#R1">=</a> 0
 <b>by </b><i>, </i>;<br/>


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