Re: Numbering of Theorems, etc.

[Richard Heck]

On 11/16/2016 04:03 AM, Bernt Lie wrote:
>
> *From:*Richard Heck [mailto:rgh...@lyx.org]
> *Sent:* tirsdag 15. november 2016 19.04
> *To:* Bernt Lie <bernt....@hit.no>; LyX Users <lyx-users@lists.lyx.org>
> *Subject:* Re: Numbering of Theorems, etc.
>
>  
>
> On 11/15/2016 09:43 AM, Bernt Lie wrote:
>
>     I use LyX 2.2.1 (currently) on Windows 10.
>
>      
>
>     I have a rather long document (some 600 pages, with 9 chapters +
>     several appendices), and want to number Exercises, Problems,
>     Examples, Theorems, etc. **independently** and numbered **by the
>     chapter** (or appendix) they appear in. Thus, exercises in chapter
>     6 should be numbered Exercise 6.1, Exercise 6.2, etc., while
>     examples in chapter 6 should be numbered Example 6.1, Example 6.2,
>     etc.
>
>      
>
>     Currently, this doesn’t work. My set-up is:
>
>     ·         Document class: Book (Standard Class)
>
>     ·         Modules: Theorems (AMS, Numbered by Type)
>
>      
>
>     What else do I need to set?
>
>
> I assume the problem is that you are not getting the "numbered by
> chapter" bit? If so, then maybe the easiest thing to do is use the
> internal LaTeX command \@addtoreset in the preamble, thus:
>     \@addtoreset{theorem}{chapter}
> Now the theorem counter gets reset whenever the chapter counter is reset.
>
> You'll need to do the same thing for any other counters you are using,
> and see the theorems-ams-bytype.inc file for the names of the various
> counters.
>
> See also: http://www.tex.ac.uk/FAQ-addtoreset.html.
>
> Richard
>
> --
>
> Richard,
>
> Thanks for quick reply. I’ve tested it (inserting
> “\@addtoreset{theorem}{chapter}” in the preamble), but now get the
> following error messages:
>
>  
>
> OK. Let me try to be a little bit more precise. Currently, the
> counters count independently. In other words, Definition 1, Definition
> 2, Theorem 1, Definition 3, Theorem 2, Example 1, etc.
>
>  
>
> However, they (i) do not contain a chapter counter, and (ii) they do
> (obviously) not reset the chapter counter in each chapter.
>

See the attached. Sorry, I got the names of the counters wrong. (I mixed
up the LyX counters and the LaTeX ones.) The LaTeX names are the same as
the names of the environments as they are declared in the preamble, e.g.:
    \newtheorem{lem}{\protect\lemmaname}
So the counter is "lem" for Lemmas.

Richard

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