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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="finseq_1.html#M2">FinSequence</a> of  <a href="numbers.html#K1">REAL</a> ;<br/>

<b>assume </b><a NAME="E1:65"/><i><font color="Green">E54</font></i>: 
 <a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> 0
 ;<br/>

<a NAME="E2:65"/><i><font color="Green">E55</font></i>: 
 <a href="binop_2.html#K33">addreal</a>  is <a href="setwiseo.html#V1">having_a_unity</a>
 
<b>by </b><i><a class="ref" href="rvsum_1.html#T3">RVSUM_1:3</a>, <a class="ref" href="setwiseo.html#D2">SETWISEO:def 2</a></i>;<br/>
<b>thus </b> <a href="rvsum_1.html#K15">Sum</a> <font color="Maroon">c<sub>1</sub></font> = 
<a href="binop_2.html#K33">addreal</a>  <a href="finsop_1.html#K2">$$</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="rvsum_1.html#D10">RVSUM_1:def 10</a></i>
<br/>.= 
0
<b>by </b><i><a class="txt" href="prob_3.html#E2:65"><i><font color="Green">E55</font></i></a>, <a class="txt" href="prob_3.html#E1:65"><i><font color="Green">E54</font></i></a>, <a class="ref" href="finsop_1.html#D1">FINSOP_1:def 1</a>, <a class="ref" href="binop_2.html#T2">BINOP_2:2</a></i>
;<br/>


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