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<b>let </b><font color="Maroon">r1</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a> ;<br/><b>let </b><font color="Maroon">r2</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a> ;<br/><b>let </b><font color="Maroon">r3</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a> ;<br/>





<b>thus </b> <a href="rvsum_1.html#K15" target="_self">Sum</a> <span class="p1"><a href="finseq_4.html#K3">&lt;*</a><span class="default"><font color="Maroon">r1</font>,<font color="Maroon">r2</font>,<font color="Maroon">r3</font></span><a href="finseq_4.html#K3">*&gt;</a></span> = 
<span class="p1">(<span class="default"><a href="rvsum_1.html#K15" target="_self">Sum</a> <span class="p2"><a href="finseq_4.html#K2">&lt;*</a><span class="default"><font color="Maroon">r1</font>,<font color="Maroon">r2</font></span><a href="finseq_4.html#K2">*&gt;</a></span></span>)</span> <a href="binop_2.html#K9">+</a> <font color="Maroon">r3</font>
<b>by </b><i><a class="ref" href="rvsum_1.html#D2" target="_self">Def2</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">r1</font> <a href="binop_2.html#K9">+</a> <font color="Maroon">r2</font></span>)</span> <a href="binop_2.html#K9">+</a> <font color="Maroon">r3</font>
<b>by </b><i/>
;<br/>


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