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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>let </b><font color="Maroon">b</font> be  <a href="xreal_0.html#V1">real</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/><b>let </b><font color="Maroon">c</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="E1:62"/><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 &amp; <font color="Maroon">b</font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0 &amp; <font color="Maroon">b</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 1 &amp; <font color="Maroon">c</font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0 )
 ;<br/>

<b>then </b><font color="Maroon">a</font> <a href="power.html#K3" target="_self">to_power</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="power.html#K5" target="_self">log</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span> <a href="xcmplx_0.html#K3">*</a> <span class="p2">(<span class="default"><a href="power.html#K5" target="_self">log</a> <font color="Maroon">b</font>,<font color="Maroon">c</font></span>)</span></span>)</span> = 
<span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="power.html#K3" target="_self">to_power</a> <span class="p2">(<span class="default"><a href="power.html#K5" target="_self">log</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span></span>)</span> <a href="power.html#K3" target="_self">to_power</a> <span class="p1">(<span class="default"><a href="power.html#K5" target="_self">log</a> <font color="Maroon">b</font>,<font color="Maroon">c</font></span>)</span>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">b</font> <a href="power.html#K3" target="_self">to_power</a> <span class="p1">(<span class="default"><a href="power.html#K5" target="_self">log</a> <font color="Maroon">b</font>,<font color="Maroon">c</font></span>)</span>
<b>by </b><i>, </i>
<br/>.= 
<font color="Maroon">c</font>
<b>by </b><i>, </i>
;<br/>
<b>hence </b><a NAME="E3:62"/>
 <a href="power.html#K5" target="_self">log</a> <font color="Maroon">a</font>,<font color="Maroon">c</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="power.html#K5" target="_self">log</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span> <a href="xcmplx_0.html#K3">*</a> <span class="p1">(<span class="default"><a href="power.html#K5" target="_self">log</a> <font color="Maroon">b</font>,<font color="Maroon">c</font></span>)</span>
 <b>by </b><i>, </i>;<br/>


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