For anyone curious about fractionally iterated exponential functions, and what use they might have, I have slides at https://www.slideshare.net/DarenWilson1/generalizing-addition-and-multiplication-to-an-operator-parametrized-by-a-real-number
Artist/Physicist, 3D graphics, worked for Cassini imaging, Z-zero factory, medical devices. Coffee addict. Not actually a licensed UFO pilot.