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<b>let </b><font color="Maroon" title="c1">X</font> be   <a href="csspace.html#NM1" title="CSSPACE:NM.1">ComplexUnitarySpace</a>;<br/><b>let </b><font color="Maroon" title="c2">seq1</font>, <font color="Maroon" title="c3">seq2</font> be   <a href="normsp_1.html#NM2" title="NORMSP_1:NM.2">sequence</a> of <font color="Maroon" title="c1">X</font>;<br/>





<b>assume </b><b>that </b><br/><a NAME="E1:10"/><i><font color="Green" title="E6">A1</font></i>: 
<font color="Maroon" title="c2">seq1</font> is <a href="clvect_3.html#V1" title="CLVECT_3:attr.1">summable</a>
 <b>and </b><br/><a NAME="E2:10"/><i><font color="Green" title="E7">A2</font></i>: 
<font color="Maroon" title="c3">seq2</font> is <a href="clvect_3.html#V1" title="CLVECT_3:attr.1">summable</a>
 ;<br/>

<a NAME="E3:10"/><i><font color="Green" title="E8">A3</font></i>: 
 <a href="clvect_3.html#K1" title="CLVECT_3:func.1">Partial_Sums</a> <font color="Maroon" title="c2">seq1</font> is <a href="clvect_2.html#V1" title="CLVECT_2:attr.1">convergent</a>
 
<b>by </b><i><a class="txt" href="clvect_3.html#E1:10"><i><font color="Green" title="E6">A1</font></i></a>, <a class="ref" href="clvect_3.html#D2" target="_self" title="CLVECT_3:def.2">Def2</a></i>;<br/>
<a NAME="E4:10"/><i><font color="Green" title="E9">A4</font></i>: 
 <a href="clvect_3.html#K1" title="CLVECT_3:func.1">Partial_Sums</a> <font color="Maroon" title="c3">seq2</font> is <a href="clvect_2.html#V1" title="CLVECT_2:attr.1">convergent</a>
 
<b>by </b><i><a class="txt" href="clvect_3.html#E2:10"><i><font color="Green" title="E7">A2</font></i></a>, <a class="ref" href="clvect_3.html#D2" target="_self" title="CLVECT_3:def.2">Def2</a></i>;<br/>
<a NAME="E5:10"/><b>then </b>
<span class="p1">(<span class="default"><a href="clvect_3.html#K1" title="CLVECT_3:func.1">Partial_Sums</a> <font color="Maroon" title="c2">seq1</font></span>)</span> <a href="clvect_1.html#K7" title="CLVECT_1:func.7">-</a> <span class="p1">(<span class="default"><a href="clvect_3.html#K1" title="CLVECT_3:func.1">Partial_Sums</a> <font color="Maroon" title="c3">seq2</font></span>)</span> is <a href="clvect_2.html#V1" title="CLVECT_2:attr.1">convergent</a>
 
<b>by </b><i><a class="txt" href="clvect_3.html#E3:10"><i><font color="Green" title="E8">A3</font></i></a>, <a class="ref" href="clvect_2.html#T4" title="CLVECT_2:th.4">CLVECT_2:4</a></i>;<br/>
<a NAME="E6:10"/><b>then </b>
 <a href="clvect_3.html#K1" title="CLVECT_3:func.1">Partial_Sums</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">seq1</font> <a href="clvect_1.html#K7" title="CLVECT_1:func.7">-</a> <font color="Maroon" title="c3">seq2</font></span>)</span> is <a href="clvect_2.html#V1" title="CLVECT_2:attr.1">convergent</a>
 
<b>by </b><i><a class="ref" href="clvect_3.html#T2" target="_self" title="CLVECT_3:th.2">Th2</a></i>;<br/>
<b>hence </b><a NAME="E7:10"/>
<font color="Maroon" title="c2">seq1</font> <a href="clvect_1.html#K7" title="CLVECT_1:func.7">-</a> <font color="Maroon" title="c3">seq2</font> is <a href="clvect_3.html#V1" title="CLVECT_3:attr.1">summable</a>
 <b>by </b><i><a class="ref" href="clvect_3.html#D2" target="_self" title="CLVECT_3:def.2">Def2</a></i>;<br/>

<b>thus </b> <a href="clvect_3.html#K2" title="CLVECT_3:func.2">Sum</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">seq1</font> <a href="clvect_1.html#K7" title="CLVECT_1:func.7">-</a> <font color="Maroon" title="c3">seq2</font></span>)</span> = 
 <a href="clvect_2.html#K1" title="CLVECT_2:func.1">lim</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="clvect_3.html#K1" title="CLVECT_3:func.1">Partial_Sums</a> <font color="Maroon" title="c2">seq1</font></span>)</span> <a href="clvect_1.html#K7" title="CLVECT_1:func.7">-</a> <span class="p2">(<span class="default"><a href="clvect_3.html#K1" title="CLVECT_3:func.1">Partial_Sums</a> <font color="Maroon" title="c3">seq2</font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="clvect_3.html#T2" target="_self" title="CLVECT_3:th.2">Th2</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="clvect_3.html#K2" title="CLVECT_3:func.2">Sum</a> <font color="Maroon" title="c2">seq1</font></span>)</span> <a href="rlvect_1.html#K6" title="RLVECT_1:func.6">-</a> <span class="p1">(<span class="default"><a href="clvect_3.html#K2" title="CLVECT_3:func.2">Sum</a> <font color="Maroon" title="c3">seq2</font></span>)</span>
<b>by </b><i><a class="txt" href="clvect_3.html#E3:10"><i><font color="Green" title="E8">A3</font></i></a>, <a class="txt" href="clvect_3.html#E4:10"><i><font color="Green" title="E9">A4</font></i></a>, <a class="ref" href="clvect_2.html#T14" title="CLVECT_2:th.14">CLVECT_2:14</a></i>
;<br/>


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