The fixdif package provides an interface for defining the style of differential operators.
The basic commands are:
\d: for differential operator "d" in math mode and under-dot accent in text;\partial: a "fixed" partial differential operator command;\letdif: an interface for defining new commands for differential operators;\mathdif: a commmand in math mode, you can use it just like\mathop, etc.
See fixdif.pdf for more. Happy TeXing!
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