Eric, Baez, and the Wizard (Re: Densitized Pseudo Twisted Forms) (2001)

I've linked to a specific post, but if you have the time and the interest, the entire 325-reply newgroup discussion is quite fascinating. I stumbled across this after seeing it linked in a MathOverflow question. It also seems to serve as the inspiration for Chris Tiee's excellent notes on tensor calculus [1].

Whenever I see an old usenet discussion like this, I can't help but wonder how life was like back then. I was only six years old in 2001, and have only faint memories of dial-up and BBS. Moreover: the first post in this thread was September 6, 2001.

[1] Chris Tiee 2010, "Contravariance, Covariance, Densities, and All That: An Informal Discussion on Tensor Calculus (https://ccom.ucsd.edu/~ctiee/notes/tensors.pdf)