Errata and Comments
The pre-published version (PPV) contains an additional chapter (Chapter 12) devoted to errata and comments
(to both versions) and a list of main typos. More small corrections
(spelling, English usage, obvious typos) had been performed in PPV, without notice
when the comprehension is not really impaired.
More comments and/or corrections (even typos) are welcome.
pre-published version (.pdf), November 21 2022