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I am writing an article in WinEdt (Windows 7), but it's creating problem in numbering the theorems in subsections. My article consists of different sections. In section 3 it starts with a Lemma and by the \begin{lemma} command it takes the number "Lemma 3.1", which is as desired. But next when I declare \begin{theorem} then it takes the number "Theorem 3.2", which should be "Theorem 3.1". Please help me to overcome this problem.

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    welcome to tex.sx. how theorem-like objects are numbered depends on how they are defined (in the preamble of your document), which in turn depends on the theorem package and/or the document class being used. you haven't identified either, so we don't have enough information to go on. what would be most helpful is a "minimum example", beginning with \documentclass and ending with \end{document} that can be cut-and-pasted for experimentation. Commented Jul 21, 2015 at 4:15
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    What are you getting is more natural (better) than what you want, (theorems, lemma, corollary) should be numbered in continous way.
    – touhami
    Commented Jul 21, 2015 at 5:10

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If you are using amsmath package, the default is for each newtheorem to be numbered separately. In your preamble, you should see something like

\newtheorem{ABC}{DEF}[GHI]

The ABC is the codename you use in the \begin command; and DEF is what is displayed (e.g. "Lemma"). GHI says how they should be numbered (chapter/section/subsection, etc.).

If the lemmas and theorems are numbered together, then your preamble probably looks like

\newtheorem{JKL}[MNO]{PQR}

In this case, JKL is the codename as before, PQR is the display name as before. However, MNO is a reference for another theorem environment that specifies that JKL and MNO should be numbered together (so in your example lemma has MNO=theorem; or theorem has MNO=lemma; or both has MNO=some other environment).

I hope this helps =)

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    You could significantly improve this answer by showing a full example and a screen shot
    – user31729
    Commented Jul 21, 2015 at 8:38

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