 0 &amp; 0 &amp; 0 &amp; 0 &amp; 0\\0 &amp; - a &amp; 1 &amp; 0 &amp; 0 &amp; 0 &amp; 0\\0 &amp; 0 &amp; - a &amp; 1 &amp; 0 &amp; 0 &amp; 0\\0 &amp; - b &amp; 0 &amp; 0 &amp; 1 &amp; 0 &amp; 0\\0 &amp; 0 &amp; - b &amp; 0 &amp; 0 &amp; 1 &amp; 0\\0 &amp; 0 &amp; 0 &amp; - b &amp; 0 &amp; 0 &amp; 1\end{matrix}\right] \left[\begin{matrix}x_{0}\\x_{1}\\x_{2}\\x_{3}\\y_{1}\\y_{2}\\y_{3}\end{matrix}\right] = L_2 (x,y)
\]</span> where</p>
<div class="sourceCode" id="cb4"><pre class="downlit sourceCode r">
<code 