I am working in the book class, and currently I have



Which generates

Lecture 11

How do I make it say,

Lecture 11-12


Lecture 11,12

  • Welcome to TeX.sx! On what basis the double number should be used? – egreg Mar 10 '13 at 0:08
  • do you always want n-(n+1) and the chapter number to increment by 2 so next would be 13-14 or just this as a special case combined chapter? – David Carlisle Mar 10 '13 at 0:09
  • Welcome to TeX.sx! Usually, we don't put a greeting or a "thank you" in our posts. While this might seem strange at first, it is not a sign of lack of politeness, but rather part of our trying to keep everything very concise. Upvoting is the preferred way here to say "thank you" to users who helped you. – Guido Mar 10 '13 at 4:16

A simplistic way, if you are going to manually set the counter is this:

\chapter{Intro to Maths}

If you are going to turn the lecture notes into something more complicated, you may have to hack the \@makechapterhead and \@makeschapterhead macros, also you will need to re-write code for the toc, figure and table captions and headings etc. I would rather stick to the standard way of one lecture one chapter and rather have a front page (hack the Part to do the combination).

enter image description here

  • 2
    \c@chapter is a counter so the \@arabic is not necessary. If anything, then \def\thechapter{\@arabic\c@chapter--\@arabic\numexpr\c@chapter+1}. – Qrrbrbirlbel Mar 10 '13 at 2:54
  • @Qrrbrbirlbel Thanks you right. I would rather then just leave the \the. Probably also better to inc the counter as well at this point. I wasn't sure what the OP was trying to do. – Yiannis Lazarides Mar 10 '13 at 3:09
  • better to use an en-dash between numbers. – barbara beeton Mar 10 '13 at 12:46
  • Why not simply \renewcommand{\thechapter}{11--12}? – egreg Mar 10 '13 at 15:55

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.