Matrix multiplication using only addition
Didn't look too deep into the paper but can I just say that I LOVE this style of academic writing? Accessible, full of examples, and in a conversing tone. Most of the math papers I come across jump right into the "Let $X \in F be ring of S^1$ and etc. I secretly believe that people heap abstractions after abstractions to purposefully shield the fact that the meat of what they've written is actually quite simple. Either that, or I've failed to understand that some ideas can't just be explained without invoking arcane symbols.