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<b>let </b><font color="Maroon">K</font> be   <a href="vectsp_1.html#NM2">Field</a>;<br/><b>let </b><font color="Maroon">V1</font> be  <a href="matrlin.html#V2" target="_self">finite-dimensional</a> <a href="vectsp_1.html#NM6">VectSp</a> of <font color="Maroon">K</font>;<br/><b>let </b><font color="Maroon">M1</font> be   <a href="matrix_1.html#NM1">Matrix</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">V1</font>, <font color="Maroon">M2</font> be   <a href="matrix_1.html#NM1">Matrix</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">V1</font>;<br/>





<b>assume </b><a NAME="E1:48"/><i><font color="Green">E43</font></i>: 
 <a href="finseq_1.html#K3">len</a> <font color="Maroon">M1</font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Maroon">M2</font>
 ;<br/>

 <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><a href="matrlin.html#K8" target="_self">Sum</a> <font color="Maroon">M1</font></span>)</span> = 
 <a href="finseq_1.html#K3">len</a> <font color="Maroon">M1</font>
<b>by </b><i/>
<br/>.= 
 <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><a href="matrlin.html#K8" target="_self">Sum</a> <font color="Maroon">M2</font></span>)</span>
<b>by </b><i>, </i>
;<br/>
<b>hence </b><span class="p1">(<span class="default"><a href="rlvect_1.html#K9">Sum</a> <span class="p2">(<span class="default"><a href="matrlin.html#K8" target="_self">Sum</a> <font color="Maroon">M1</font></span>)</span></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p1">(<span class="default"><a href="rlvect_1.html#K9">Sum</a> <span class="p2">(<span class="default"><a href="matrlin.html#K8" target="_self">Sum</a> <font color="Maroon">M2</font></span>)</span></span>)</span> = 
 <a href="rlvect_1.html#K9">Sum</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="matrlin.html#K8" target="_self">Sum</a> <font color="Maroon">M1</font></span>)</span> <a href="fvsum_1.html#K3">+</a> <span class="p2">(<span class="default"><a href="matrlin.html#K8" target="_self">Sum</a> <font color="Maroon">M2</font></span>)</span></span>)</span>
<b>by </b><i/>
<br/>.= 
 <a href="rlvect_1.html#K9">Sum</a> <span class="p1">(<span class="default"><a href="matrlin.html#K8" target="_self">Sum</a> <span class="p2">(<span class="default"><font color="Maroon">M1</font> <a href="matrlin.html#K9" target="_self">^^</a> <font color="Maroon">M2</font></span>)</span></span>)</span>
<b>by </b><i/>
;<br/><br/>


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