In an article, I need the counter for Theorems (Lemmas), like Theorem X.Y. But, somewhere I do not need the counter for the Theorems, for example: in preface/appendix or somewhere else like Theorem.

Q: How to define the environment for the Theorem or Lemma.


With amsthm you can define a new theorem environment using


If you want an unnumbered version similar to this, then use


Use the theorem* environment inside the preface or appendix, and theorem elsewhere. Here is a minimal example:

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This is a numbered theorem.

This is an unnumbered theorem.


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