<<< native
[ EDelimited
    "{"
    ""
    [ Right
        (EArray
           [ AlignLeft , AlignLeft ]
           [ [ [ ESub (EMathOperator "div") (EIdentifier "x")
               , EIdentifier "u"
               , ESuper (EMathOperator "div") (EIdentifier "x")
               , EIdentifier "u"
               , ESubsup (EMathOperator "div") (EIdentifier "x") (EIdentifier "y")
               , EIdentifier "u"
               , ESubsup (EMathOperator "div") (EIdentifier "x") (EIdentifier "y")
               , EIdentifier "u"
               ]
             , [ EText TextNormal "operatorname" ]
             ]
           , [ [ EUnder
                   True
                   (EMathOperator "\8902-lim'sup")
                   (EGrouped [ EIdentifier "x" , ESymbol Rel "\8594" , ENumber "0" ])
               , EIdentifier "u"
               , EOver True (EMathOperator "\8902-lim'sup") (EIdentifier "w")
               , EIdentifier "u"
               , EUnderover
                   True
                   (EMathOperator "\8902-lim'sup")
                   (EGrouped [ EIdentifier "x" , ESymbol Rel "\8594" , ENumber "0" ])
                   (EIdentifier "w")
               , EIdentifier "u"
               , EUnderover
                   True
                   (EMathOperator "\8902-lim'sup")
                   (EGrouped [ EIdentifier "x" , ESymbol Rel "\8594" , ENumber "0" ])
                   (EIdentifier "w")
               , EIdentifier "u"
               ]
             , [ EText TextNormal "operatorname*" ]
             ]
           , [ [ ESub
                   (EMathOperator "\8902-lim'sup")
                   (EGrouped [ EIdentifier "x" , ESymbol Rel "\8594" , ENumber "0" ])
               , EIdentifier "u"
               , ESuper (EMathOperator "\8902-lim'sup") (EIdentifier "w")
               , EIdentifier "u"
               , ESubsup
                   (EMathOperator "\8902-lim'sup")
                   (EGrouped [ EIdentifier "x" , ESymbol Rel "\8594" , ENumber "0" ])
                   (EIdentifier "w")
               , EIdentifier "u"
               , ESubsup
                   (EMathOperator "\8902-lim'sup")
                   (EGrouped [ EIdentifier "x" , ESymbol Rel "\8594" , ENumber "0" ])
                   (EIdentifier "w")
               , EIdentifier "u"
               ]
             , [ EText TextNormal "operatorname*:nolimits" ]
             ]
           , [ [ ESub (EMathOperator "curl") (EIdentifier "x")
               , EIdentifier "v"
               , EUnder True (EMathOperator "argmax") (EIdentifier "K")
               , EIdentifier "u"
               ]
             , [ EText TextNormal "DeclareMathOperator" ]
             ]
           ])
    ]
]
>>> eqn
left { matrix{
lcol{ {"div" sub x u "div" sup x u "div" sub x sup y u "div" sub x sup y u} above {"⋆-lim'sup" from {x -> 0} u "⋆-lim'sup" to w u "⋆-lim'sup" from {x -> 0} to w u "⋆-lim'sup" from {x -> 0} to w u} above {"⋆-lim'sup" sub {x -> 0} u "⋆-lim'sup" sup w u "⋆-lim'sup" sub {x -> 0} sup w u "⋆-lim'sup" sub {x -> 0} sup w u} above {"curl" sub x v "argmax" from K u} }
lcol{ {roman "operatorname"} above {roman "operatorname*"} above {roman "operatorname*:nolimits"} above {roman "DeclareMathOperator"} }
} right ""