@GeoffDalgas OK, it seems that a lot of \{ \} in between $ signs have been replaced with { } and are therefore invisible when compiled. For example, here (the display formula for $\Delta_2$), and here (the definition of $\mathbb T$).

Thanks, @GeoffDalgas !

Plus, computer science, theoretical computer science, physics, philosophy,...

I'm color blind as well. The most serious issue with this is that I have trouble distinguishing the red and green used in traffic lights in Europe.

Ah, that must be, of course! I'll wait then before going through hundreds of answers, despairing, and trying to edit them one-by-one by hand.

Oh, I didn't see this. I asked essentially the same, with another example.