I have a user interface problem that I hope isn't only solved by adding yet another option for authors to understand.

Student types a mathematical expression. We allow implicit multiplication, so xy is interpreted as x*y.
What to do about pi? Is it p*i or π?

I guess most of the time, you'd expect it to be interpreted as π. But you might be doing something with complex numbers, and p*i is really what you meant.
I suppose rendering π would at least give you a hint to add the * symbol

@christianp relatedly, is $$\sin x$$ a trig function applied to a variable, or the product of four different variables? ;)

@tpfto worse: is sin2x $$\sin^2(x)$$ or $$\sin(2x)$$?

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