Post

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.

This feels a bit like the school-level insistence on using the triple lines for identities instead of talking about equality of *functions*.

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.