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I've almost never seen an upright 'd' in mathematical literature, though it seems to be somewhat more common in engineering texts. Ditto for the imaginary unit
by fdej 15y ago
I've almost never seen an upright 'd' in mathematical literature, though it seems to be somewhat more common in engineering texts. Ditto for the imaginary unit 'i' and the constant 'e'. Matter of taste.
- wnoise 15y agoAll three are set upright in _The Princeton Companion to Mathematics_ (Gowers).
- rsaarelm 15y agoHm. Now I wonder where I got the idea that of course it's supposed to be upright. Though I have been reading the Princeton Companion book mentioned in sibling. I guess the problem is that the system drops the space between the expression and the dx, outputting the "xdx". Math text does have space before dx even if the letter is italic.