https://www.arrantpedantry.com/2020/03/24/umlauts-diaereses-...
Seems weird to me, I'd just use a hyphen, but that's how they roll.
If they can't see that, it's hard to think they have much chance with the actual math. "A mathematician is a person who knows how to separate the relevant from the irrelevant", a saying I was told in school.
e^(i*tau) = 1
I won't reproduce https://www.tauday.com/tau-manifesto here, but I'll just mention one part of it. I very much prefer doing radian math using tau rather than pi: tau/4 radians is just one-fourth of a "turn", one-fourth of the way around the circle, i.e. 90°. Which is a lot easier to remember than pi/2, and would have made high-school trig so much easier for me. (I never had trouble with radians, and even so I would have had a much easier time grasping them had I been taught them using tau rather than pi as the key value).
Edit: or, when you can't do actual math, you complain about notation.
It’s just quiet whispers in small conferences at the moment, but this is how the breaking of all spells begins. The momentum is & will continue to build, and probably quicker than many imagine (or will like!).