<<< native
[ EIdentifier "M"
, ESymbol Rel "="
, EDelimited
    "["
    "]"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter , AlignCenter , AlignCenter ]
           [ [ [ ESub (EIdentifier "\945") (ENumber "1") ]
             , [ ESubsup (EIdentifier "\945") (ENumber "1") (EIdentifier "q") ]
             , [ ESymbol Ord "\8943" ]
             , [ ESubsup
                   (EIdentifier "\945")
                   (ENumber "1")
                   (ESuper
                      (EIdentifier "q")
                      (EGrouped [ EIdentifier "n" , ESymbol Bin "\8722" , ENumber "1" ]))
               ]
             ]
           , [ [ ESub (EIdentifier "\945") (ENumber "2") ]
             , [ ESubsup (EIdentifier "\945") (ENumber "2") (EIdentifier "q") ]
             , [ ESymbol Ord "\8943" ]
             , [ ESubsup
                   (EIdentifier "\945")
                   (ENumber "2")
                   (ESuper
                      (EIdentifier "q")
                      (EGrouped [ EIdentifier "n" , ESymbol Bin "\8722" , ENumber "1" ]))
               ]
             ]
           , [ [ ESymbol Ord "\8942" ]
             , [ ESymbol Ord "\8942" ]
             , [ ESymbol Rel "\8945" ]
             , [ ESymbol Ord "\8942" ]
             ]
           , [ [ ESub (EIdentifier "\945") (EIdentifier "m") ]
             , [ ESubsup
                   (EIdentifier "\945") (EIdentifier "m") (EIdentifier "q")
               ]
             , [ ESymbol Ord "\8943" ]
             , [ ESubsup
                   (EIdentifier "\945")
                   (EIdentifier "m")
                   (ESuper
                      (EIdentifier "q")
                      (EGrouped [ EIdentifier "n" , ESymbol Bin "\8722" , ENumber "1" ]))
               ]
             ]
           ])
    ]
]
>>> eqn
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{ cdots above cdots above \[u22F1] above cdots }
ccol{ {alpha sub 1 sup {q sup {n - 1}}} above {alpha sub 2 sup {q sup {n - 1}}} above \[u22EE] above {alpha sub m sup {q sup {n - 1}}} }
} right ]