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<b>let </b><font color="Maroon">X</font> be   <a href="bhsp_1.html#NM1">RealUnitarySpace</a>;<br/><b>let </b><font color="Maroon">seq</font> be   <a href="normsp_1.html#NM2">sequence</a> of <font color="Maroon">X</font>;<br/>



<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ] <b>means </b><font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">a<sub>1</sub></font> is <a href="bhsp_4.html#V1" target="_self">summable</a>;<br/>
<b>assume </b><a NAME="E1:16"/>
<font color="Maroon">seq</font> is <a href="bhsp_4.html#V1" target="_self">summable</a>
 ;<br/>

<a NAME="E2:16"/><b>then </b><i><font color="Green">E44</font></i>: 
<font color="Maroon">S<sub>1</sub></font>[0]
 
<b>by </b><i><a class="ref" href="bhsp_3.html#T35">BHSP_3:35</a></i>;<br/>
<a NAME="E3:16"/><i><font color="Green">E46</font></i>: 
for <font color="Olive">k</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>   st <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">k</font>] holds <br/><font color="Maroon">S<sub>1</sub></font>[<font color="Olive">k</font> <a href="nat_1.html#K1">+</a> 1]
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="16_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">k</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>

<b>assume </b><a NAME="E1:16_1"/>
<font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">k</font> is <a href="bhsp_4.html#V1" target="_self">summable</a>
 ;<br/>

<a NAME="E2:16_1"/><b>then </b>
 <a href="bhsp_4.html#K1" target="_self">Partial_Sums</a> <span class="p1">(<span class="default"><font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">k</font></span>)</span> is <a href="bhsp_2.html#V1">convergent</a>
 
<b>by </b><i/>;<br/>
<a NAME="E3:16_1"/><b>then </b><i><font color="Green">E47</font></i>: 
<span class="p1">(<span class="default"><a href="bhsp_4.html#K1" target="_self">Partial_Sums</a> <span class="p2">(<span class="default"><font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">k</font></span>)</span></span>)</span> <a href="bhsp_3.html#K2">^\</a> 1 is <a href="bhsp_2.html#V1">convergent</a>
 
<b>by </b><i><a class="ref" href="bhsp_3.html#T44">BHSP_3:44</a></i>;<br/>
<a NAME="E4:16_1"/><i><font color="Green">E49</font></i>: 
<font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <span class="p1">(<span class="default"><font color="Maroon">k</font> <a href="nat_1.html#K1">+</a> 1</span>)</span> <a href="funct_2.html#R2">=</a> <span class="p1">(<span class="default"><font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">k</font></span>)</span> <a href="bhsp_3.html#K2">^\</a> 1
 
<b>by </b><i><a class="ref" href="bhsp_3.html#T37">BHSP_3:37</a></i>;<br/>
<b>reconsider </b><font color="Maroon">seq1</font> = <a href="numbers.html#K5">NAT</a>  <a href="funcop_1.html#K2">--&gt;</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">k</font></span>)</span> <a href="normsp_1.html#K2">.</a> 0</span>)</span> as   <a href="normsp_1.html#NM2">sequence</a> of <font color="Maroon">X</font> <b>by </b><i><a class="ref" href="funcop_1.html#T57">FUNCOP_1:57</a></i>;<br/>
<a NAME="E6:16_1"/><i><font color="Green">E50</font></i>: 
for <font color="Olive">m</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">seq1</font> <a href="normsp_1.html#K2">.</a> <font color="Olive">m</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">k</font></span>)</span> <a href="normsp_1.html#K2">.</a> 0
 
<b>by </b><i><a class="ref" href="funcop_1.html#T13">FUNCOP_1:13</a></i>;<br/>
<a NAME="E7:16_1"/><i><font color="Green">E59</font></i>: 
<font color="Maroon">seq1</font> is <a href="bhsp_2.html#V1">convergent</a>
 
<b>by </b><i><a class="ref" href="bhsp_2.html#T1">BHSP_2:1</a></i>;<br/>
<a NAME="E8:16_1"/>
 <a href="bhsp_4.html#K1" target="_self">Partial_Sums</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">k</font></span>)</span> <a href="bhsp_3.html#K2">^\</a> 1</span>)</span> <a href="funct_2.html#R2">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="bhsp_4.html#K1" target="_self">Partial_Sums</a> <span class="p3">(<span class="default"><font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">k</font></span>)</span></span>)</span> <a href="bhsp_3.html#K2">^\</a> 1</span>)</span> <a href="normsp_1.html#K4">-</a> <font color="Maroon">seq1</font>
 
<b>by </b><i>, </i>;<br/>
<a NAME="E9:16_1"/><b>then </b>
 <a href="bhsp_4.html#K1" target="_self">Partial_Sums</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">seq</font> <a href="bhsp_3.html#K2">^\</a> <font color="Maroon">k</font></span>)</span> <a href="bhsp_3.html#K2">^\</a> 1</span>)</span> is <a href="bhsp_2.html#V1">convergent</a>
 
<b>by </b><i>, , <a class="ref" href="bhsp_2.html#T4">BHSP_2:4</a></i>;<br/>
<b>hence </b><a NAME="E10:16_1"/>
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">k</font> <a href="nat_1.html#K1">+</a> 1]
 <b>by </b><i>, </i>;<br/>


</div><b>end;</b></div>
<b>thus </b><a NAME="E4:16"/>
for <font color="Olive">k</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">k</font>]
 <b>from </b><i><a class="ref" href="nat_1.html#S1">NAT_1:sch 1</a>(, );</i><br/>


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