Whoever wrote this Wikiversity article about Solomon-Reed error correction, _specifically_ oriented around QR code reading, _specifically_ geared toward coders, I could kiss you. It exactly bridges the divide I have been struggling with between the math being explained too mathily with tons of Greek letters and abstract concepts, and code where it’s a bunch of unexplained bitshifts and modulos without being legible as math (and usually written for a different purpose). https://en.wikiversity.org/wiki/Reed%E2%80%93Solomon_codes_for_coders