title: Restriction on size of matrix?
body: <p>The difference between this code:</p>
  
  <pre><code>\begin{align*}
      I &amp;= \begin{pmatrix}
           0   &amp; 1  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  0.5   &amp;  1 &amp;  0    &amp; 1  &amp; 1\\
           0   &amp; 1  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  0.5   &amp;  1 &amp;  0    &amp; 1  &amp; 1\\
           1   &amp; 1  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  0.5   &amp;  1 &amp;  0    &amp; 1  &amp; 0\\
           1   &amp; 1  &amp;  0    &amp;  1    &amp;  1  &amp;  0    &amp;  0     &amp;  1 &amp;  1    &amp; 0  &amp; 0\\
           1   &amp; 1  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  1     &amp;  1 &amp;  1    &amp; 0  &amp; 0\\
           0   &amp; 0  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  1     &amp;  1 &amp;  0    &amp; 0  &amp; 1\\
           0   &amp; 0  &amp;  0.5  &amp;  0.5  &amp;  1  &amp;  1    &amp;  1     &amp;  1 &amp;  1    &amp; 0  &amp; 0\\
      \end{pmatrix}\\
  \end{align*}
  </code></pre>
  
  <p>which does not compile, and this one which does compile</p>
  
  <pre><code>\begin{align*}
      I &amp;= \begin{pmatrix}
           0   &amp; 1  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  0.5   &amp;  1 &amp;  0    &amp; 1\\
           0   &amp; 1  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  0.5   &amp;  1 &amp;  0    &amp; 1\\
           1   &amp; 1  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  0.5   &amp;  1 &amp;  0    &amp; 1\\
           1   &amp; 1  &amp;  0    &amp;  1    &amp;  1  &amp;  0    &amp;  0     &amp;  1 &amp;  1    &amp; 0\\
           1   &amp; 1  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  1     &amp;  1 &amp;  1    &amp; 0\\
           0   &amp; 0  &amp;  0.5  &amp;  0.5  &amp;  0  &amp;  0.5  &amp;  1     &amp;  1 &amp;  0    &amp; 0\\
           0   &amp; 0  &amp;  0.5  &amp;  0.5  &amp;  1  &amp;  1    &amp;  1     &amp;  1 &amp;  1    &amp; 0\\
      \end{pmatrix}\\
  \end{align*}
  </code></pre>
  
  <p>is that the one tha does compile does not have the last column. What gives?</p>