Questo è il documento
`
\documentclass[a4paper,10pt,twoside,openright]{scrbook}
\usepackage[english,italian]{babel}
\usepackage[utf8]{inputenc}
\makeatletter
\@namedef{ver@fixltx2e.sty}{3000/01/01}
\makeatother
\usepackage{classicthesis-ldpkg}
\usepackage[minionpro]{classicthesis}
\usepackage{MnSymbol}
\usepackage{amsmath}
\areaset[5mm]{312pt}{660pt}
\usepackage{amsthm}
\usepackage[all]{xy}
\newtheorem{theorem}{Teorema}[chapter]
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{proposition}[theorem]{Proposizione}
\newtheorem*{lemman}{Lemma}
\theoremstyle{definition}
\newtheorem{definition}{Definizione}[chapter]
\newtheorem{example}{Esempio}[chapter]
\theoremstyle{remark}
\newtheorem*{remark}{Remark}
\usepackage{enumitem}
\usepackage[pdftex]{graphicx}
\numberwithin{equation}{chapter}
\makeatletter
\def\Ddots{\mathinner{\mkern1mu\raise\p@
\vbox{\kern7\p@\hbox{.}}\mkern2mu
\raise4\p@\hbox{.}\mkern2mu\raise7\p@\hbox{.}\mkern1mu}}
\makeatother
\title{}
\setcounter{chapter}{-1}
\author{———}
\begin{document}
\renewcommand*\thesection{\arabic{section}}\maketitle
\include{chapter0}
\include{chapter1}
\include{chapter2}
\include{chapter3}\end{document}
`Il file chapter0 è invece qualcosa di questo tipo
`
\chapter{Preliminari sui gruppi algebrici}
\section{La nozione di gruppo algebrico}
\begin{definition}…
`Ebbene, se io aggiungo tra il comando \chapter e il successivo \section un’altro \section tipo
\section{varietà algebriche}
ottengo il seguente errore:
`
ERROR: Argument of \@firstofone has an extra }.— TeX said —
\par
l.2 \section{Varietà Algebriche}— HELP —
From the .log file…I've run across a `}' that doesn't seem to match anything.
For example, `\def\a#1{…}' and `\a}' would produce
this error. If you simply proceed now, the `\par' that
I've just inserted will cause me to report a runaway
argument that might be the root of the problem. But if
your `}' was spurious, just type `2' and it will go away.
`Spero in qualche aiuto. Grazie in anticipo.
Ho provato il tuo codice (senza i Minion Pro, che non ho):
`\documentclass[a4paper,10pt,twoside,openright]{scrbook}
\usepackage[english,italian]{babel}
\usepackage[utf8]{inputenc}
\makeatletter
\@namedef{ver@fixltx2e.sty}{3000/01/01}
\makeatother
\usepackage{classicthesis-ldpkg}
\usepackage{classicthesis}
\usepackage{MnSymbol}
\usepackage{amsmath}
\areaset[5mm]{312pt}{660pt}
\usepackage{amsthm}
\usepackage[all]{xy}
\newtheorem{theorem}{Teorema}[chapter]
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{proposition}[theorem]{Proposizione}
\newtheorem*{lemman}{Lemma}
\theoremstyle{definition}
\newtheorem{definition}{Definizione}[chapter]
\newtheorem{example}{Esempio}[chapter]
\theoremstyle{remark}
\newtheorem*{remark}{Remark}
\usepackage{enumitem}
\usepackage[pdftex]{graphicx}
\numberwithin{equation}{chapter}
\makeatletter
\def\Ddots{\mathinner{\mkern1mu\raise\p@
\vbox{\kern7\p@\hbox{.}}\mkern2mu
\raise4\p@\hbox{.}\mkern2mu\raise7\p@\hbox{.}\mkern1mu}}
\makeatother
\title{}
\setcounter{chapter}{-1}
\author{———}
\begin{document}
\renewcommand*\thesection{\arabic{section}}
\maketitle
\include{chapter0}
\end{document}`
e
`\chapter{Preliminari sui gruppi algebrici}
\section{La nozione di gruppo algebrico}
\section{Una sezione}
\begin{definition}
Una
\end{definition}
\section{Un'altra sezione}
\begin{definition}
Prova
\end{definition}`
per simulare un capitolo “chapter0” (al posto di \include ho provato anche \input, come consigliato sulle guide).
Ottengo quattro warning, ma niente errori.
Ciao,
Antonio