This is a follow-up question to the one about the capitalization of chapter names in the book class. Now I would like to make capital the names of book parts in the book class.
Part 1 --> PART 1
I use ShareLaTeX with XeLaTeX.
\documentclass{book}
\usepackage{fontspec}
\usepackage[english,greek]{babel}
\setmainfont
[
UprightFont = *,
BoldFont = *Bold,
ItalicFont = *It,
BoldItalicFont = *BoldIt,
Extension = .otf,
Ligatures = TeX,
Mapping = tex-text
]{GFSArtemisia}
\setsansfont[Mapping = tex-text]{GFSArtemisia.otf}
\setmathfont{latinmodern-math.otf}
\setmathfont[range = \varnothing]{Asana-Math.otf}
\setmathfont[range = \int]{latinmodern-math.otf}
\begin{document}
\end{document}


\renewcommand\partname{PART}? If this doesn't work, please provide more information regarding your setup. Some things (like packages or language settings) influence the availability or formatting of sectional units. – Werner Mar 01 '16 at 20:57