In my thesis I use chapters, sections and subsection. I like to have my equations numbered with respect to section, but I want the displayed equations numbers not to include the chapter number. Moreover when referencing the equations I want the chapter number to be excluded unless I reference them from a different chapter.

How can I achieve this? If not otherwise possible it would be ok to use two commands \ref{} and \gref{} where the first one omits the chapter number. I would like to do the same thing also for references to sections and to theorems. At the moment I am using the koma scrbook class.


I. Chapter 1
1. Section 1
  a^2 + b^2 = c^2         (1.1)
as seen in (1.1)

II. Chapter 2
1. Section 1
an extension of (I.1.1) is
  a^3 + b^3 = c^3         (1.1)

You can make the prefix conditional on the current chapter being different to the saved chapter in the reference, something like












  • This works when my chapters are number arabic. How does this work if I have the chapters number with roman? My \renewcommand\thechapter{\Roman{chapter}} messes this up. – H. Brandsmeier Mar 11 '13 at 21:46
  • @cideous replace \maybe{\thechapter} by \maybe{\arabic{chapter}} – David Carlisle Mar 11 '13 at 21:50
  • Just add \renewcommand\thechapter{\Roman{chapter}} as the second line in your example. – H. Brandsmeier Mar 11 '13 at 21:50
  • @cideous Code updated as in comments – David Carlisle Mar 11 '13 at 21:54

I think that there is a slight mistake here. If:


is used, then the current chapter will be displayed, and not the referred chapter. I propose to use instead:


And it works!

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