<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">X</font> be   <a href="csspace.html#NM1">ComplexUnitarySpace</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>let </b><font color="Maroon">z</font> be   <a href="cfunct_1.html#NM1">Complex</a>;<br/>





<b>assume </b><a NAME="E1:31"/>
<font color="Maroon">seq</font> is <a href="clvect_3.html#V2" target="_self">absolutely_summable</a>
 ;<br/>

<a NAME="E2:31"/><b>then </b>
<span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><font color="Maroon">seq</font></span><a href="clvect_2.html#K2">.||</a></span> is <a href="series_1.html#V1">summable</a>
 
<b>by </b><i/>;<br/>
<a NAME="E3:31"/><b>then </b><i><font color="Green">E45</font></i>: 
<span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">z</font></span><a href="complex1.html#K17">.|</a></span> <a href="seq_1.html#K14">(#)</a> <span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><font color="Maroon">seq</font></span><a href="clvect_2.html#K2">.||</a></span> is <a href="series_1.html#V1">summable</a>
 
<b>by </b><i><a class="ref" href="series_1.html#T13">SERIES_1:13</a></i>;<br/>
<a NAME="E4:31"/>
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds <br/> ( <span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span></span><a href="clvect_2.html#K2">.||</a></span> <a href="seq_1.html#K2">.</a> <font color="Olive">n</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0 &amp; <span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span></span><a href="clvect_2.html#K2">.||</a></span> <a href="seq_1.html#K2">.</a> <font color="Olive">n</font> <a href="xxreal_0.html#R1">&lt;=</a> <span class="p1">(<span class="default"><span class="p2"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">z</font></span><a href="complex1.html#K17">.|</a></span> <a href="seq_1.html#K14">(#)</a> <span class="p2"><a href="clvect_2.html#K2">||.</a><span class="default"><font color="Maroon">seq</font></span><a href="clvect_2.html#K2">.||</a></span></span>)</span> <a href="seq_1.html#K2">.</a> <font color="Olive">n</font> )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="31_1"><b>proof </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/>

<b>thus </b><a NAME="E1:31_1"/>
<span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span></span><a href="clvect_2.html#K2">.||</a></span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="31_1_1"><b>proof </b></a><div class="add">

<a NAME="E1:31_1_1"/>
<span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span></span><a href="clvect_2.html#K2">.||</a></span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="csspace.html#K13">||.</a><span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span> <a href="normsp_1.html#K2">.</a> <font color="Maroon">n</font></span>)</span></span><a href="csspace.html#K13">.||</a></span>
 
<b>by </b><i><a class="ref" href="clvect_2.html#D3">CLVECT_2:def 3</a></i>;<br/>
<b>hence </b><a NAME="E2:31_1_1"/>
<span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span></span><a href="clvect_2.html#K2">.||</a></span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0
 <b>by </b><i><a class="ref" href="csspace.html#T46">CSSPACE:46</a></i>;<br/>


</div><b>end;</b></div>

<b>thus </b><a NAME="E2:31_1"/>
<span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span></span><a href="clvect_2.html#K2">.||</a></span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font> <a href="xxreal_0.html#R1">&lt;=</a> <span class="p1">(<span class="default"><span class="p2"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">z</font></span><a href="complex1.html#K17">.|</a></span> <a href="seq_1.html#K14">(#)</a> <span class="p2"><a href="clvect_2.html#K2">||.</a><span class="default"><font color="Maroon">seq</font></span><a href="clvect_2.html#K2">.||</a></span></span>)</span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="31_1_2"><b>proof </b></a><div class="add">

<span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span></span><a href="clvect_2.html#K2">.||</a></span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font> = 
<span class="p1"><a href="csspace.html#K13">||.</a><span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span> <a href="normsp_1.html#K2">.</a> <font color="Maroon">n</font></span>)</span></span><a href="csspace.html#K13">.||</a></span>
<b>by </b><i><a class="ref" href="clvect_2.html#D3">CLVECT_2:def 3</a></i>
<br/>.= 
<span class="p1"><a href="csspace.html#K13">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K1">*</a> <span class="p3">(<span class="default"><font color="Maroon">seq</font> <a href="normsp_1.html#K2">.</a> <font color="Maroon">n</font></span>)</span></span>)</span></span><a href="csspace.html#K13">.||</a></span>
<b>by </b><i><a class="ref" href="clvect_1.html#D14">CLVECT_1:def 14</a></i>
<br/>.= 
<span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">z</font></span><a href="complex1.html#K17">.|</a></span> <a href="real_1.html#K4">*</a> <span class="p1"><a href="csspace.html#K13">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">seq</font> <a href="normsp_1.html#K2">.</a> <font color="Maroon">n</font></span>)</span></span><a href="csspace.html#K13">.||</a></span>
<b>by </b><i><a class="ref" href="csspace.html#T45">CSSPACE:45</a></i>
<br/>.= 
<span class="p1"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">z</font></span><a href="complex1.html#K17">.|</a></span> <a href="real_1.html#K4">*</a> <span class="p1">(<span class="default"><span class="p2"><a href="clvect_2.html#K2">||.</a><span class="default"><font color="Maroon">seq</font></span><a href="clvect_2.html#K2">.||</a></span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font></span>)</span>
<b>by </b><i><a class="ref" href="clvect_2.html#D3">CLVECT_2:def 3</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">z</font></span><a href="complex1.html#K17">.|</a></span> <a href="seq_1.html#K14">(#)</a> <span class="p2"><a href="clvect_2.html#K2">||.</a><span class="default"><font color="Maroon">seq</font></span><a href="clvect_2.html#K2">.||</a></span></span>)</span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font>
<b>by </b><i><a class="ref" href="seq_1.html#T13">SEQ_1:13</a></i>
;<br/>
<b>hence </b><a NAME="E2:31_1_2"/>
<span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span></span><a href="clvect_2.html#K2">.||</a></span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font> <a href="xxreal_0.html#R1">&lt;=</a> <span class="p1">(<span class="default"><span class="p2"><a href="complex1.html#K17">|.</a><span class="default"><font color="Maroon">z</font></span><a href="complex1.html#K17">.|</a></span> <a href="seq_1.html#K14">(#)</a> <span class="p2"><a href="clvect_2.html#K2">||.</a><span class="default"><font color="Maroon">seq</font></span><a href="clvect_2.html#K2">.||</a></span></span>)</span> <a href="seq_1.html#K2">.</a> <font color="Maroon">n</font>
 ;<br/>


</div><b>end;</b></div>


</div><b>end;</b></div>
<a NAME="E5:31"/><b>then </b>
<span class="p1"><a href="clvect_2.html#K2">||.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font></span>)</span></span><a href="clvect_2.html#K2">.||</a></span> is <a href="series_1.html#V1">summable</a>
 
<b>by </b><i>, <a class="ref" href="series_1.html#T24">SERIES_1:24</a></i>;<br/>
<b>hence </b><a NAME="E6:31"/>
<font color="Maroon">z</font> <a href="clvect_1.html#K9">*</a> <font color="Maroon">seq</font> is <a href="clvect_3.html#V2" target="_self">absolutely_summable</a>
 <b>by </b><i/>;<br/>


</div>
