[coditor]

Fascinating despite being way over my head. Amazing to see math of such complexity done without a computer - we're so spoiled today.

[stiff]

I am not a physicist, maybe one would elaborate on this, but it seems to be rather straightforward mathematics for a physicist to use (fancied-up calculus), and I don't know how a computer would help here at the level of development computers are today, my laymans impression is that the art here lied in choosing what to derive, not in the derivations themselves.