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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be   <a href="nat_1.html#NM1">Nat</a>;<br/>



<b>assume </b><a NAME="E1:7"/><i><font color="Green">E8</font></i>: 
( 2 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">c<sub>1</sub></font> &amp; <font color="Maroon">c<sub>2</sub></font> <a href="radix_1.html#R1">is_represented_by</a> 1,<font color="Maroon">c<sub>1</sub></font> )
 ;<br/>

<b>hence </b> <a href="radix_3.html#K7">DigA_SDSub</a> <span class="p1">(<span class="default"><a href="radix_3.html#K10">SD2SDSub</a> <span class="p2">(<span class="default"><a href="radix_1.html#K10">DecSD</a> <font color="Maroon">c<sub>2</sub></font>,1,<font color="Maroon">c<sub>1</sub></font></span>)</span></span>)</span>,<span class="p1">(<span class="default">1 <a href="nat_1.html#K1">+</a> 1</span>)</span> = 
 <a href="radix_3.html#K5">SDSub_Add_Carry</a> <span class="p1">(<span class="default"><a href="radix_1.html#K4">DigA</a> <span class="p2">(<span class="default"><a href="radix_1.html#K10">DecSD</a> <font color="Maroon">c<sub>2</sub></font>,1,<font color="Maroon">c<sub>1</sub></font></span>)</span>,1</span>)</span>,<font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="radix_4.html#T3" target="_self">Th3</a></i>
<br/>.= 
 <a href="radix_3.html#K5">SDSub_Add_Carry</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="txt" href="radix_4.html#E1:7"><i><font color="Green">E8</font></i></a>, <a class="ref" href="radix_1.html#T24">RADIX_1:24</a></i>
;<br/><br/>


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