<<< tex
   \gamma_1\equiv \gamma_2 \iff \left\{ \begin{array}{l} \gamma_1(0)=\gamma_2(0)=p, \text{ and }\\ [1.0ex]
   \left.\frac{\mathrm{d}}{\mathrm{d}t}\phi\circ\gamma_1(t)\right|_{t=0} = \left.\frac{\mathrm{d}}{\mathrm{d}t}\phi\circ\gamma_2(t)\right|_{t=0}
   \end{array} \right.

>>> native
[ ESub (EIdentifier "\947") (ENumber "1")
, ESymbol Rel "\8801"
, ESub (EIdentifier "\947") (ENumber "2")
, ESymbol Rel "\8660"
, EDelimited
    "{"
    ""
    [ Right
        (EArray
           [ AlignLeft ]
           [ [ [ ESub (EIdentifier "\947") (ENumber "1")
               , EDelimited "(" ")" [ Right (ENumber "0") ]
               , ESymbol Rel "="
               , ESub (EIdentifier "\947") (ENumber "2")
               , EDelimited "(" ")" [ Right (ENumber "0") ]
               , ESymbol Rel "="
               , EIdentifier "p"
               , ESymbol Pun ","
               , EText TextNormal " and "
               ]
             ]
           , [ [ ESub
                   (EDelimited
                      ""
                      "|"
                      [ Right
                          (EFraction
                             NormalFrac
                             (EStyled TextNormal [ EIdentifier "d" ])
                             (EGrouped
                                [ EStyled TextNormal [ EIdentifier "d" ] , EIdentifier "t" ]))
                      , Right (EIdentifier "\981")
                      , Right (ESymbol Bin "\8728")
                      , Right (ESub (EIdentifier "\947") (ENumber "1"))
                      , Right (EDelimited "(" ")" [ Right (EIdentifier "t") ])
                      ])
                   (EGrouped [ EIdentifier "t" , ESymbol Rel "=" , ENumber "0" ])
               , ESymbol Rel "="
               , ESub
                   (EDelimited
                      ""
                      "|"
                      [ Right
                          (EFraction
                             NormalFrac
                             (EStyled TextNormal [ EIdentifier "d" ])
                             (EGrouped
                                [ EStyled TextNormal [ EIdentifier "d" ] , EIdentifier "t" ]))
                      , Right (EIdentifier "\981")
                      , Right (ESymbol Bin "\8728")
                      , Right (ESub (EIdentifier "\947") (ENumber "2"))
                      , Right (EDelimited "(" ")" [ Right (EIdentifier "t") ])
                      ])
                   (EGrouped [ EIdentifier "t" , ESymbol Rel "=" , ENumber "0" ])
               ]
             ]
           ])
    ]
]