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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>assume </b><a NAME="E1:71"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0
 ;<br/>

<a NAME="E2:71"/><i><font color="Green">E26</font></i>: 
( <span class="p1">(<span class="default"><a href="matrix_1.html#K12">1.</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="matrix_6.html#K5" target="_self">~</a>  <a href="hidden.html#R1">=</a>  <a href="matrix_1.html#K12">1.</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font> &amp;  <a href="matrix_1.html#K12">1.</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font> is <a href="matrix_6.html#V1" target="_self">Reversible</a> )
 
<b>by </b><i><a class="ref" href="matrix_6.html#T8" target="_self">Th8</a></i>;<br/>
<a NAME="E3:71"/>
<span class="p1">(<span class="default"><a href="matrix_1.html#K12">1.</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="matrix_1.html#K5">@</a>  <a href="hidden.html#R1">=</a>  <a href="matrix_1.html#K12">1.</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="matrix_6.html#E1:71"><i><font color="Green">E25</font></i></a>, <a class="ref" href="matrix_6.html#T10" target="_self">Th10</a></i>;<br/>
<b>hence </b><a NAME="E4:71"/>
 <a href="matrix_1.html#K12">1.</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font> is <a href="matrix_6.html#V4" target="_self">Orthogonal</a>
 <b>by </b><i><a class="txt" href="matrix_6.html#E2:71"><i><font color="Green">E26</font></i></a>, <a class="ref" href="matrix_6.html#D7" target="_self">Def7</a></i>;<br/>


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