19.test

<<< native
[ EDelimited
    "["
    "]"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "1") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "1") ])
               ]
             , [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "2") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "1") ])
               ]
             ]
           , [ [ ESpace (2 % 9) ] ]
           , [ [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "1") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "2") ])
               ]
             , [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "2") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "2") ])
               ]
             ]
           ])
    ]
, EDelimited
    "("
    ")"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
, EDelimited
    "{"
    "}"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
, EDelimited
    "\8739"
    "\8739"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
, EDelimited
    "\8741"
    "\8741"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
]
>>> starmath
left [ matrix { {{partial x_1} over {partial y_1}} # {{partial x_2} over {partial y_1}} ## {} # {} ## {{partial x_1} over {partial y_2}} # {{partial x_2} over {partial y_2}} } right ] left ( matrix { 1 # 2 ## 3 # 4 } right ) left lbrace matrix { 1 # 2 ## 3 # 4 } right rbrace left lline matrix { 1 # 2 ## 3 # 4 } right rline left ldline matrix { 1 # 2 ## 3 # 4 } right rdline