One of the pieces I wrote for the Leap Day 2016 A-to-Z was to explain the Matrix. Matrices turn up a lot in mathematics. They’re nice things. They organize a lot of information economically. They’re vector spaces, so that a lot of really nice tools come along with their existence. They don’t have much to do with what I’ve been writing about this year, but, so what? I can bring back from obscurity pieces I just liked, too.
All my A-to-Z pieces, from every year, should be at this link. And all of the 2020 A-to-Z pieces should be at this link. Also please let me know if you have ideas for the letters P, Q, and R. I’m also still eagerly looking for Playful Math Education Blog Carnival-ready pieces. Thank you.