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Currently creating a workbook for A2 Differentiation and wondering at what point I'll give up ensuring every 'd' is non-italicised in equations... #lifestooshort

Next up: a non-italicised f in every function

That's one I don't agree with. Non-italicised function names are only if they are _proper_ names like sin or log. You everyday common-or-garden f, g, and h should be italicised.

We may have to disagree then, but I think italicised function names tend to be produced by those who over-use equation editor; exam boards don’t, decent textbooks don’t. Function names aren’t variables so shouldn’t be italicised. Next up, angels dancing on the head of a pin!

Function names *are* variables. Just not numerical variables. Functions aren't special mathematical objects. The correct distinction is between constants, like e, π, sin, cos, and other things.

If f(x) = cos (x), would you you italicise the f and the cos? Surely not