There is a channel on youtube called 3blue1brown where Grant Sanderson does exceptional math videos. I have heard interest in quaternions expressed in the J community so I will put in some links that provide visual explanations of quaternions and how to visualize their actions across 4 dimensions.
Initial video introducing quaternions: https://www.youtube.com/watch?v=d4EgbgTm0Bg Short video introducing an interactive tool to investigate quaternion behaviour: https://www.youtube.com/watch?v=zjMuIxRvygQ Site containing the interactive videos https://eater.net/quaternions (yes these videos are interactive and can be manipulated in real time!) Enjoy Cheers, bob ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
