I am so glad that some really clever people are commenting on this and are appreciative of your knowledge and FANTASTIC teaching abilities. You know me. All I can say is that I was mesmerised by the moving pictures (Your skill with Wolfram Mathematica is seriously impressive), and all i could think was: will this help me untangle the Christmas tree lights next year? 😂😂😂💞💞💞
PS: I know someone asked whether you deliberately use a small i for self reference. I do that ALL the time. [my computer often self corrects it though, Grrr) I have a theory on it. It basically boils down to the fact that when we are writing (and in the flow) we detach from the ego. Something like that. Sending love 💚