[RightWhale]

There is a heavy amount of math, not trivial. Matrix analysis. If you want that and to get it right, try Hermann Weyl for the real deal. 'Symmetry' is an entertaining read, or you can go deep with 'Time Space Matter'. It was crystallography that produced the data that led to quantum mechanics. Hermann Weyl did a fair job with philosophy, too. You won't be disappointed. Princeton, you know, like Einstein and Goedel.

[betty boop]

Hermann Weyl... will have to keep my eyes open for him! Thanks for the suggestion, RW; will follow up in due course. IIRC, Robert A. Herrmann thinks highly of him (have been studying Herrmann lately).

Thanks RightWhale!