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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="nat_1.html#NM1">Nat</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="vectsp_1.html#NM2">Field</a>;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be   <a href="matrix_1.html#NM5">Matrix</a> of <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/>





<b>assume </b><a NAME="E1:61"/><i><font color="Green">E12</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0
 ;<br/>

<a NAME="E2:61"/><i><font color="Green">E13</font></i>: 
(  <a href="finseq_1.html#K3">len</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font> &amp;  <a href="matrix_1.html#K1">width</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font> )
 
<b>by </b><i><a class="ref" href="matrix_1.html#T25">MATRIX_1:25</a></i>;<br/>
<span class="p1">(<span class="default"><a href="matrix_8.html#K1" target="_self">Trace</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p1">(<span class="default"><a href="matrix_8.html#K1" target="_self">Trace</a> <span class="p2">(<span class="default"><a href="matrix_6.html#K1">-</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span> = 
 <a href="matrix_8.html#K1" target="_self">Trace</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="matrix_6.html#K2">+</a> <span class="p2">(<span class="default"><a href="matrix_6.html#K1">-</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="matrix_8.html#T54" target="_self">Th54</a></i>
<br/>.= 
 <a href="matrix_8.html#K1" target="_self">Trace</a> <span class="p1">(<span class="default"><a href="matrix_3.html#K1">0.</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>1</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="matrix_8.html#E1:61"><i><font color="Green">E12</font></i></a>, <a class="txt" href="matrix_8.html#E2:61"><i><font color="Green">E13</font></i></a>, <a class="ref" href="matrix_4.html#T2">MATRIX_4:2</a></i>
<br/>.= 
 <a href="matrix_8.html#K1" target="_self">Trace</a> <span class="p1">(<span class="default"><a href="matrix_1.html#K11">0.</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font></span>)</span>

<br/>.= 
 <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">c<sub>2</sub></font>
<b>by </b><i><a class="ref" href="matrix_8.html#T56" target="_self">Th56</a></i>
;<br/>
<b>hence </b><a NAME="E4:61"/>
 <a href="matrix_8.html#K1" target="_self">Trace</a> <span class="p1">(<span class="default"><a href="matrix_6.html#K1">-</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="rlvect_1.html#K5">-</a> <span class="p1">(<span class="default"><a href="matrix_8.html#K1" target="_self">Trace</a> <font color="Maroon">c<sub>3</sub></font></span>)</span>
 <b>by </b><i><a class="ref" href="rlvect_1.html#T19">RLVECT_1:19</a></i>;<br/>


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