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I am using LaTeX theorem style where I have at the top:


and then I use


This numbers the theorems, definitions, and lemmas separately. Is where a way to do it where the definitions aren't numbered (but still use the rest of the theorem style)?

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up vote 10 down vote accepted

You can get unnumbered theorem-like environment loading either amsthm or ntheorem and saying


These two packages introduce also the concept of "theorem style" that helps to get, for example, upright text inside the definition environment. For amsthm it would be


and similarly for ntheorem

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With the front-end package thmtools (and amsthm or ntheorem as back-ends), the corresponding definitions for the two structures would be






The definition pre-defined style from amsthm can be used by saying

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