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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.

And don't get me started on exam boards' typesetting habits ...

Was going to quote repost this and just reposted by mistake, but I *just* learned about this the last few days talking with my Y10 daughter about her maths class and it took me several minutes of questioning her before I understood what the triple lines were meaning.