Math & Science ⇒ Using numberwithin

[notnek]

I want to label equations in my document with (2.b.c) indicating the subsection b and equation c in chapter 2. For all of the other chapters, I would like (d.e) to indicate the chapter d and equation number e (there are no subsections in the other chapters).

Can someone help me with this? I can use \numberwithin{equation}{subsection} in the preamble but this labels equations like (a.b.c) for the whole document.

[Juanjo]

The chngcntr package provides the commands \counterwithin and \counterwithout, which have the same syntax as \numberwithin. The \counterwithin command behaves exactly as \numberwithin (use whichever you prefer of both). Likewise, \counterwithout undoes any counter subordination. There are also starred variants of both commands. After \counterwithin{equation}{section}, the equation counter is reset each time the section counter is increased. After \counterwithout{equation}{section}, the equation counter is released to its previous state, not dependent on sections. In your case, you may combine this commands at the beginning and the end of the problematic chapter.

[notnek]

That works great. Thank you!

[localghost]

That works great. […]

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Thorsten