> Relatedly, differentials shouldn't be italicized. Its \int\mathrm{d}x, not \int dx. Interesting. I went to school in the late 80s in the UK. As an adult, I w

> Relatedly, differentials shouldn't be italicized. Its \int\mathrm{d}x, not \int dx. Interesting. I went to school in the late 80s in the UK. As an adult, I was convinced I'd been taught as a child that the d of dx should not be italicised, as only variables like x should be italicised. But when I checked that belief, I couldn't really find any evidence that that was, or ever had been, the case. I had assumed until I read your comment that I'd misremembered it. If I google for "integration" or "differential equations", and click on the images tab, every result without exception has the d italicised (at least for me).