<<< 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" ]
             ]
           ])
    ]
]
>>> tex
\begin{cases}
\operatorname{div}_{x}u\operatorname{div}^{x}u\operatorname{div}_{x}^{y}u\operatorname{div}_{x}^{y}u & \text{operatorname} \\
\operatorname*{\star-lim'sup}_{x \rightarrow 0}u\operatorname*{\star-lim'sup}^{w}u\operatorname*{\star-lim'sup}_{x \rightarrow 0}^{w}u\operatorname*{\star-lim'sup}_{x \rightarrow 0}^{w}u & \text{operatorname*} \\
\operatorname{\star-lim'sup}_{x \rightarrow 0}u\operatorname{\star-lim'sup}^{w}u\operatorname{\star-lim'sup}_{x \rightarrow 0}^{w}u\operatorname{\star-lim'sup}_{x \rightarrow 0}^{w}u & \text{operatorname*:nolimits} \\
\operatorname{curl}_{x}v\operatorname*{argmax}_{K}u & \text{DeclareMathOperator}
\end{cases}