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thank you very much. thats exactly what i've been looking for. vmz

hi all, i'd like to typeset following (jacobian) matrix. \begin{equation*} J = \begin{bmatrix} \dfrac{\partial \Delta a_{1}}{\partial c_{1}} & \dfrac{\partial \Delta a_{1}}{\partial d_{1}} & \ldots & \dfrac{\partial \Delta a_{1}}{\partial c_{m}} & \dfrac{\partial \Delta a_{1}}{\parti...