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As long as we're nitpicking, the d in front of the theta shouldn't really be italicizes, anyway. I'd class that more as an input error than an output error, though.


Actually, many mathematics authors use an italic d while the upright d convention is standard in physics and engineering.


Is that to disambiguate it from the upright d in exterior calculus?

That would be funny, as that symbol was chosen specifically to overload with the traditional little-d notation from Leibniz.




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