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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="E1:24"/><i><font color="Green">E13</font></i>: 
<font color="Maroon">c<sub>3</sub></font> is <a href="matrix_6.html#V1" target="_self">Reversible</a>
 ;<br/>

<a NAME="E2:24"/><i><font color="Green">E14</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="matrix_6.html#K5" target="_self">~</a>  <a href="matrix_6.html#R2" target="_self">is_reverse_of</a> <font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="txt" href="matrix_6.html#E1:24"><i><font color="Green">E13</font></i></a>, <a class="ref" href="matrix_6.html#D4" target="_self">Def4</a></i>;<br/>
<a NAME="E3:24"/><b>then </b>
<font color="Maroon">c<sub>3</sub></font> <a href="matrix_6.html#K5" target="_self">~</a>  is <a href="matrix_6.html#V1" target="_self">Reversible</a>
 
<b>by </b><i><a class="ref" href="matrix_6.html#D3" target="_self">Def3</a></i>;<br/>
<b>hence </b><a NAME="E4:24"/>
( <font color="Maroon">c<sub>3</sub></font> <a href="matrix_6.html#K5" target="_self">~</a>  is <a href="matrix_6.html#V1" target="_self">Reversible</a> &amp; <span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="matrix_6.html#K5" target="_self">~</a> </span>)</span> <a href="matrix_6.html#K5" target="_self">~</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>3</sub></font> )
 <b>by </b><i><a class="txt" href="matrix_6.html#E2:24"><i><font color="Green">E14</font></i></a>, <a class="ref" href="matrix_6.html#D4" target="_self">Def4</a></i>;<br/>


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