Chapter numbering with two parts as: I.1, I.2.. II.1, II.2,

Question

I am working in a report class for my thesis that has two parts (say part I and part II). I would like to have my Chapter numbering for instance as: I.1, I.2, ... II.1, II.2 etc. I now have that the chapter numbering just continues (so part II starts with chapter 10), I know I can 'reset' the chapter number so that part II starts with chapter 1 again, but is there a way to put the par t number in front?

Thanks in advance!

Well as far as I see, this only resets the chapter number (and that I know how to do), but it does not change the chapter name from Chapter "1" to Chapter "I.1" — Claire Wagenaar, Aug 01 '22 at 10:51
@ClaireWagenaar try the solution with \usepackage{chngcntr} and \counterwithin{chapter}{part} — koleygr, Aug 01 '22 at 12:00
Does this answer your question? Using titletoc to redefine chapter toc entry as part number + chapter — Miyase, Aug 01 '22 at 12:01

score 1 · Answer 1 · answered Aug 01 '22 at 12:01

You can use \counterwithin{chapter}{part}. Using the unstarred version of \ccounterwithin, the command \thechapter is automatically renewed as you want it.

Here's a complete example.

\documentclass{report}
\counterwithin{chapter}{part}
\begin{document}
\part{First part}
\chapter{Chapter I.1}
\chapter{Chapter I.2}
\part{Second part}
\chapter{Chapter II.1}
\chapter{Chapter II.2}
\end{document}

The first chapter of the second part looks like this:

Chapter numbering with two parts as: I.1, I.2.. II.1, II.2,

1 Answers1