On Wed, 20 Dec 2017, Ricardo Berlasso wrote:
Technically speaking, that's not wrong (at least, not completely): it's possible to have a book without "parts", but if you try to write subsections without sections you'll have problems. "Parts" are optional and in fact they have "level -1" assigned (chapters are "level 0").
Ricardo, Yes, a book class does not require Parts, but that's still the maximum sectioning possible for that class. Chapter is not the maximum. That's the point I tried to make. Regards, Rich
