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<b>let </b><font color="Maroon" title="c1">A</font>, <font color="Maroon" title="c2">B</font> be   <a href="matrix_1.html#NM1" title="MATRIX_1:NM.1">Matrix</a> of <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a> ;<br/>

<b>assume </b><a NAME="E1:11"/><i><font color="Green" title="E10">A1</font></i>: 
(  <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <font color="Maroon" title="c1">A</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="c2">B</font> &amp;  <a href="matrix_1.html#K1" title="MATRIX_1:func.1">width</a> <font color="Maroon" title="c1">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="matrix_1.html#K1" title="MATRIX_1:func.1">width</a> <font color="Maroon" title="c2">B</font> &amp;  <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <font color="Maroon" title="c1">A</font> <a href="xxreal_0.html#NR4" title="XXREAL_0:NR.4">&gt;</a>  <a href="numbers.html#K6" title="NUMBERS:func.6">0</a>  )
 ;<br/>

<a NAME="E2:11"/><i><font color="Green" title="E11">A2</font></i>: 
(  <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <span class="p1">(<span class="default"><a href="matrixr1.html#K4" title="MATRIXR1:func.4">-</a> <font color="Maroon" title="c2">B</font></span>)</span> <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="c2">B</font> &amp;  <a href="matrix_1.html#K1" title="MATRIX_1:func.1">width</a> <span class="p1">(<span class="default"><a href="matrixr1.html#K4" title="MATRIXR1:func.4">-</a> <font color="Maroon" title="c2">B</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="matrix_1.html#K1" title="MATRIX_1:func.1">width</a> <font color="Maroon" title="c2">B</font> )
 
<b>by </b><i><a class="ref" href="matrix_3.html#D2" title="MATRIX_3:def.2">MATRIX_3:def 2</a></i>;<br/>
<b>thus </b><span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="matrixr1.html#K3" title="MATRIXR1:func.3">+</a> <font color="Maroon" title="c2">B</font></span>)</span> <a href="matrixr1.html#K5" title="MATRIXR1:func.5">-</a> <font color="Maroon" title="c2">B</font> = 
<span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="matrixr1.html#K3" title="MATRIXR1:func.3">+</a> <font color="Maroon" title="c2">B</font></span>)</span> <a href="matrixr1.html#K3" title="MATRIXR1:func.3">+</a> <span class="p1">(<span class="default"><a href="matrixr1.html#K4" title="MATRIXR1:func.4">-</a> <font color="Maroon" title="c2">B</font></span>)</span>
<b>by </b><i><a class="ref" href="matrix_4.html#D1" title="MATRIX_4:def.1">MATRIX_4:def 1</a></i>
<br/>.= 
<font color="Maroon" title="c1">A</font> <a href="matrixr1.html#K3" title="MATRIXR1:func.3">+</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">B</font> <a href="matrixr1.html#K3" title="MATRIXR1:func.3">+</a> <span class="p2">(<span class="default"><a href="matrixr1.html#K4" title="MATRIXR1:func.4">-</a> <font color="Maroon" title="c2">B</font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="matrixr2.html#E1:11"><i><font color="Green" title="E10">A1</font></i></a>, <a class="txt" href="matrixr2.html#E2:11"><i><font color="Green" title="E11">A2</font></i></a>, <a class="ref" href="matrix_3.html#T5" title="MATRIX_3:th.5">MATRIX_3:5</a></i>
<br/>.= 
<font color="Maroon" title="c1">A</font> <a href="matrixr1.html#K3" title="MATRIXR1:func.3">+</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">B</font> <a href="matrixr1.html#K5" title="MATRIXR1:func.5">-</a> <font color="Maroon" title="c2">B</font></span>)</span>
<b>by </b><i><a class="ref" href="matrix_4.html#D1" title="MATRIX_4:def.1">MATRIX_4:def 1</a></i>
<br/>.= 
<font color="Maroon" title="c1">A</font>
<b>by </b><i><a class="txt" href="matrixr2.html#E1:11"><i><font color="Green" title="E10">A1</font></i></a>, <a class="ref" href="matrixr2.html#T7" target="_self" title="MATRIXR2:th.7">Th7</a></i>
;<br/>


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