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<b>let </b><font color="Maroon">s</font> be   <a href="seq_1.html#NM1">Real_Sequence</a>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:20"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">s</font> is <a href="series_1.html#V1" target="_self">summable</a>
 <b>and </b><br/><a NAME="E2:20"/><i><font color="Green">E32</font></i>: 
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  0 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">s</font> <a href="funct_2.html#K3">.</a> <font color="Olive">n</font>
 ;<br/>

<a NAME="E3:20"/><i><font color="Green">E33</font></i>: 
 <a href="series_1.html#K1" target="_self">Partial_Sums</a> <font color="Maroon">s</font> is <a href="seqm_3.html#V3">non-decreasing</a>
 
<b>by </b><i>, </i>;<br/>
<a NAME="E4:20"/><i><font color="Green">E34</font></i>: 
 <a href="series_1.html#K1" target="_self">Partial_Sums</a> <font color="Maroon">s</font> is <a href="seq_2.html#V4">convergent</a>
 
<b>by </b><i>, </i>;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="20_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><a NAME="E1:20_1"/><i><font color="Green">E35</font></i>: 
<span class="p1">(<span class="default"><a href="series_1.html#K1" target="_self">Partial_Sums</a> <font color="Maroon">s</font></span>)</span> <a href="funct_2.html#K3">.</a> 0 <a href="xxreal_0.html#R1">&lt;=</a> <span class="p1">(<span class="default"><a href="series_1.html#K1" target="_self">Partial_Sums</a> <font color="Maroon">s</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">n</font>
 <b>by </b><i>, <a class="ref" href="seqm_3.html#T21">SEQM_3:21</a></i>;<br/><a NAME="E2:20_1"/>
0 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">s</font> <a href="funct_2.html#K3">.</a> 0
 <b>by </b><i/>;<br/><b>hence </b><a NAME="E3:20_1"/>
0 <a href="xxreal_0.html#R1">&lt;=</a> <span class="p1">(<span class="default"><a href="series_1.html#K1" target="_self">Partial_Sums</a> <font color="Maroon">s</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">n</font>
 <b>by </b><i>, </i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E6:20"/>
0 <a href="xxreal_0.html#R1">&lt;=</a>  <a href="series_1.html#K2" target="_self">Sum</a> <font color="Maroon">s</font>
 <b>by </b><i>, <a class="ref" href="seq_2.html#T31">SEQ_2:31</a></i>;<br/>


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