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<b>let </b><font color="Maroon" title="c1">x1</font>, <font color="Maroon" title="c2">y1</font> be    <a href="finseq_1.html#M2" title="FINSEQ_1:mode.2">FinSequence</a> of  <a href="numbers.html#K2" title="NUMBERS:func.2">COMPLEX</a> ;<br/><b>let </b><font color="Maroon" title="c3">x2</font>, <font color="Maroon" title="c4">y2</font> be    <a href="finseq_1.html#M2" title="FINSEQ_1:mode.2">FinSequence</a> of  <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a> ;<br/>



<b>assume </b><a NAME="E1:61"/><i><font color="Green" title="E51">A1</font></i>: 
( <font color="Maroon" title="c1">x1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">x2</font> &amp; <font color="Maroon" title="c2">y1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c4">y2</font> &amp;  <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <font color="Maroon" title="c1">x1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <font color="Maroon" title="c4">y2</font> )
 ;<br/>

<font color="Maroon" title="c1">x1</font> <a href="complsp1.html#K4" title="COMPLSP1:func.4">-</a> <font color="Maroon" title="c2">y1</font> = 
<a href="binop_2.html#K28" title="BINOP_2:func.28">diffcomplex</a>  <a href="finseqop.html#K1" title="FINSEQOP:func.1">.:</a> <font color="Maroon" title="c1">x1</font>,<font color="Maroon" title="c2">y1</font>
<b>by </b><i><a class="ref" href="complsp1.html#D8" title="COMPLSP1:def.8">COMPLSP1:def 8</a></i>
<br/>.= 
<a href="binop_2.html#K34" title="BINOP_2:func.34">diffreal</a>  <a href="finseqop.html#K1" title="FINSEQOP:func.1">.:</a> <font color="Maroon" title="c3">x2</font>,<font color="Maroon" title="c4">y2</font>
<b>by </b><i><a class="txt" href="complsp2.html#E1:61"><i><font color="Green" title="E51">A1</font></i></a>, <a class="ref" href="complsp2.html#T50" target="_self" title="COMPLSP2:th.50">Th50</a></i>
<br/>.= 
<font color="Maroon" title="c3">x2</font> <a href="rvsum_1.html#K8" title="RVSUM_1:func.8">-</a> <font color="Maroon" title="c4">y2</font>
<b>by </b><i><a class="ref" href="rvsum_1.html#D6" title="RVSUM_1:def.6">RVSUM_1:def 6</a></i>
;<br/>
<b>hence </b><a NAME="E3:61"/>
<font color="Maroon" title="c1">x1</font> <a href="complsp1.html#K4" title="COMPLSP1:func.4">-</a> <font color="Maroon" title="c2">y1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">x2</font> <a href="rvsum_1.html#K8" title="RVSUM_1:func.8">-</a> <font color="Maroon" title="c4">y2</font>
 ;<br/>


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