I remember now... These are "quaternions!"
13 June 2024 at 15:08
Imaginary Numbers are Matrices [Japanese with English captions] โ If you would like to have imaginary numbers and quaternions explained in the form of a dialogue between anthropomorphized vocal synthesizers, then Zundamon and Metan are here to oblige you. Zundamon's Theorem is a channel with more of these mathematically enriching conversations.