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<b>let </b><font color="Maroon">D</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">f</font> be    <a href="finseq_1.html#M2">FinSequence</a> of  <a href="rfunct_3.html#K4" target="_self">PFuncs</a> <font color="Maroon">D</font>,<a href="numbers.html#K1">REAL</a> ;<br/><b>let </b><font color="Maroon">G</font> be    <a href="rfunct_3.html#M2" target="_self">Element</a> of  <a href="rfunct_3.html#K4" target="_self">PFuncs</a> <font color="Maroon">D</font>,<a href="numbers.html#K1">REAL</a> ;<br/>





<b>set </b><font color="Maroon">o</font> =  <a href="rfunct_3.html#K14" target="_self">addpfunc</a> <font color="Maroon">D</font>;<br/>
<a NAME="E1:34"/><i><font color="Green">E30</font></i>: 
(  <a href="rfunct_3.html#K14" target="_self">addpfunc</a> <font color="Maroon">D</font> is <a href="binop_1.html#V1">commutative</a> &amp;  <a href="rfunct_3.html#K14" target="_self">addpfunc</a> <font color="Maroon">D</font> is <a href="binop_1.html#V2">associative</a> &amp;  <a href="rfunct_3.html#K14" target="_self">addpfunc</a> <font color="Maroon">D</font> <a href="setwiseo.html#NR1" target="_self">has_a_unity</a>  )
 
<b>by </b><i>, , </i>;<br/>
<b>thus </b> <a href="rfunct_3.html#K15" target="_self">Sum</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="finseq_1.html#K8">^</a> <span class="p2"><a href="finseq_1.html#K12">&lt;*</a><span class="default"><font color="Maroon">G</font></span><a href="finseq_1.html#K12">*&gt;</a></span></span>)</span> = 
<span class="p1">(<span class="default"><a href="rfunct_3.html#K14" target="_self">addpfunc</a> <font color="Maroon">D</font></span>)</span> <a href="binop_1.html#K2">.</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="rfunct_3.html#K14" target="_self">addpfunc</a> <font color="Maroon">D</font></span>)</span> <a href="finsop_1.html#K2">$$</a> <font color="Maroon">f</font></span>)</span>,<font color="Maroon">G</font>
<b>by </b><i>, <a class="ref" href="finsop_1.html#T5">FINSOP_1:5</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="rfunct_3.html#K15" target="_self">Sum</a> <font color="Maroon">f</font></span>)</span> <a href="rfunct_3.html#K6" target="_self">+</a> <font color="Maroon">G</font>
<b>by </b><i/>
;<br/>


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