I completely agree. Several members of my family are NVC practitioners, but I usually hear their comments as passive aggressive. As a result, NVC sometimes seems more confrontational to me due to the effort put into disguising what is said.
Yep. Long time lurker on hacker news, but never felt the need to comment before. To be clear supernova's comment didn't trigger me - I just felt that it was worth pointing out that the document was not uncommon in my experience.
When I was studying mathematical physics, my classmates and I made similar quick reference notes in latex. Based on a cursory look, it seems to be missing some important complex analysis and abstract algebra/lie theory results (although I haven't read what the author studied).