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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="nat_1.html#NM1">Nat</a>;<br/>

<a NAME="E1:13"/><i><font color="Green">E12</font></i>: 
0 <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font> <a href="radix_3.html#K1" target="_self">-SD_Sub_S</a> 
 
<b>by </b><i><a class="ref" href="radix_3.html#T7" target="_self">Th7</a></i>;<br/>
<a NAME="E2:13"/>
<font color="Maroon">c<sub>1</sub></font> <a href="radix_3.html#K1" target="_self">-SD_Sub_S</a>  <a href="tarski.html#R1">c=</a> <font color="Maroon">c<sub>1</sub></font> <a href="radix_3.html#K2" target="_self">-SD_Sub</a> 
 
<b>by </b><i><a class="ref" href="radix_3.html#T3" target="_self">Th3</a></i>;<br/>
<b>hence </b><a NAME="E3:13"/>
0 <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font> <a href="radix_3.html#K2" target="_self">-SD_Sub</a> 
 <b>by </b><i><a class="txt" href="radix_3.html#E1:13"><i><font color="Green">E12</font></i></a></i>;<br/>


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