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difforms[mixpar] - ensure equality of mixed partial derivatives
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Calling Sequence
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mixpar(expr)
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Description
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The function mixpar will take nested calls to diff, and sort the sequence of differentiations so that they are sorted by lexicographical ordering on the variables of differentiation.
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The purpose of this function is to ensure that equal mixed partials are recognized as equal.
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The command with(difforms,mixpar) allows the use of the abbreviated form of this command.
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Examples
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