I'm stitching 4 research papers using the book class. The first two papers are closely related, so I would like the chapter labelling to be as following:

  • Chapter 1a
  • Chapter 1b
  • Chapter 2
  • Chapter 3

Is there a way to achieve this mixed numbering with some LaTeX variant?

1 Answer 1


By redefining \thechapter and altering the value of counter chapter, the following example works, though not very elegant.







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