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I am using LyX to typeset a document. I wanted to use another theorem-like construct not available in amsthm. So I included it using LaTeX code.

\newtheorem{discussion}{Discussion}[section]

This works fine except the next theorem that appears using the built in theorem construct ends up having the same number as the one above. I tried using \stepcounter and \addtocounter, but this does not change the numbering.

Any idea how to fix this?

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    There is no built-in theorem construct, unless it's LyX that provides one. – egreg Mar 20 '12 at 14:08
  • @egreg: By "built-in" I meant "available in amsthm". I might be using incorrect terminology, but I don't think what I mean is ambiguous. – Zoey Mar 20 '12 at 14:12
  • @henrique: I had read about the MWE, but as I said I am using LyX to do this, so I am not sure how I can provide an MWE for that. If I export to latex and try to compile, I end up getting a bunch of errors which are not representative of my situation. – Zoey Mar 20 '12 at 14:24
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If you want this new structure to share the counter of a previously defined theorem-like environment, you can use the first optional argument of \newtheorem to indicate the counter dependance; for example:

\newtheorem{theorem}{Theorem}[section]
\newtheorem{discussion}[theorem]{Discussion}
  • Thanks for the answer. This is exactly what I had initially. This did not work for me either. Perhaps it's the way LyX interacts with latex code. – Zoey Mar 20 '12 at 14:19
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    @Zoey Then, we'll need to see a minimal, complete example of your actual code showing the settings relevant for this issue. Please add this minimal version to your question. – Gonzalo Medina Mar 20 '12 at 14:22
  • I am using LyX to do this, so I am not sure how I can provide an MWE for that. If I export to latex and try to compile, I end up getting a bunch of errors which are not representative of my situation. – Zoey Mar 20 '12 at 14:28
  • @Zoey: and I have no idea about LyX; anyway, build in LyX a document as short as possible illustrating the problem and then export it to LaTeX, and upload it somewhere. Add the link to your original question so someone can take a look at it and see if the problem can be found. – Gonzalo Medina Mar 20 '12 at 18:16

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