Posted: Apr 19, 2020 7:40 am
Curvilinear coordinate system, not Cartesian - the mathematical foundation. There is no x-y-z in this demonstration. There's into-the-blackboard, and so on, and r and "theta" and "phi".
Lifeboat for the rational mind :D
http://www.rationalskepticism.org/
http://www.rationalskepticism.org/viewtopic.php?p=2743596#p2743596