Comment by loloquwowndueo

Technical pens (staedtler) are great for math writing and quite precise (I studied engineering and used these a lot for notes with lots of formulas, diagrams, math notation etc), but the ink does take a bit to dry so it can be smeary particularly for left-handed use. They’re also a bit unforgiving with writing angles (likely not optimized for writing, for sure but they do work)