M = left [ matrix{
ccol{ {alpha sub 1} above {alpha sub 2} above \[u22ee] above {alpha sub m} }
ccol{ {alpha sub 1 sup q} above {alpha sub 2 sup q} above \[u22ee] above {alpha sub m sup q} }
ccol{ \[u22ef] above \[u22ef] above \[u22f1] above \[u22ef] }
ccol{ {alpha sub 1 sup {q sup {n \[u2212] 1}}} above {alpha sub 2 sup {q sup {n \[u2212] 1}}} above \[u22ee] above {alpha sub m sup {q sup {n \[u2212] 1}}} }
} right ]