ui
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The derivative of the solution variable ui with respect to the spatial coordinate xj, for example, uy
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The second derivative of the solution variable ui with respect to the spatial coordinates xj and xk, for example, uxx, uxy
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uit
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The derivative of the solution variable ui with respect to time as seen from the frame chosen under Discretization
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uitt
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The second derivative of the solution variable ui with respect to time as seen from the frame chosen under Discretization
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The mixed derivative of the solution variable ui with respect to time and the spatial coordinate xj as seen from the frame chosen under Discretization
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