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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/>

<b>assume </b><a NAME="E1:27"/>
<font color="Maroon">c<sub>1</sub></font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 2
 ;<br/>

<b>set </b><font color="Maroon">c<sub>2</sub></font> = 0;<br/>
<a NAME="E2:27"/><i><font color="Green">E22</font></i>: 
 <a href="radix_1.html#K1">Radix</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="binarith.html#K5">-'</a> 1</span>)</span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 
<b>by </b><i><a class="ref" href="power.html#T39">POWER:39</a></i>;<br/>
<a NAME="E3:27"/><i><font color="Green">E23</font></i>: 
 <a href="radix_1.html#K1">Radix</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="binarith.html#K5">-'</a> 1</span>)</span> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0
 
;<br/>
<a NAME="E4:27"/>
 <a href="xcmplx_0.html#K4">-</a> <span class="p1">(<span class="default"><a href="radix_1.html#K1">Radix</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="binarith.html#K5">-'</a> 1</span>)</span></span>)</span> <a href="xxreal_0.html#R1">&lt;=</a> 0 <a href="xcmplx_0.html#K6">-</a> 0
 
;<br/>
<b>hence </b><a NAME="E5:27"/>
 <a href="radix_3.html#K5" target="_self">SDSub_Add_Carry</a> 0,<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> 0
 <b>by </b><i><a class="txt" href="radix_3.html#E2:27"><i><font color="Green">E22</font></i></a>, <a class="txt" href="radix_3.html#E3:27"><i><font color="Green">E23</font></i></a>, <a class="ref" href="radix_3.html#D3" target="_self">Def3</a></i>;<br/>


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