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Proper form of the "dx"[]

I thought the proper form was to distinguish it somehow from the product of two variables named "d" and "x". One way to do this is with \mathrm{d}x instead of dx. With that in mind, I boldly went ahead and changed the article. Revert if I overstepped!—GraemeMcRaetalk 21:23, September 30, 2010 (UTC)

\operatorname{d}\! instead of \,\mathrm{d}[]

It would be better to use \operatorname{d}\!x (e.g. ) instead of \,\mathrm{d} (e.g. ), because \operatorname already inserts a space before the "d", and originates from [1]