Most standard styles highlight theorems and definitions using italics. Now this is something I really would like to avoid in my thesis (and generally). Unfortunately, if I just remove this "feature", I am left with the problem that it isn't obvious anymore where a theorem ends and the normal body text continues. I am wondering whether there is a not-too-complicated way to make theorem environments visually like quote environments, i. e. greater horizontal offset. What should I do?

An additional question in case this is too easy: What if I don't just want a greater horizontal offset, but also a vertical line on the level of the normal offset going all the way down until the end of the theorem?


1 Answer 1


For the first question, you can define a new environment using the quote environment and some therem-like structure from, for example, the amsthm package; for the second question, the leftbar environment from the framed package can be useful. A little example that you can use as starting point:





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    or switch to the ntheorem package, which can do even wilder markings
    – daleif
    Mar 28, 2011 at 21:08
  • Hi Gonzalo, thanks a lot, but I'm getting errors like these: pastebin.com/PKXP8ekw Could you comment on what I'm doing wrong? Mar 28, 2011 at 22:08
  • @darij grinberg: you are using \newtheorem{lemma}[theorem]{Lemma} but I defined theo instead of theorem, so simply change \newtheorem{lemma}[theorem]{Lemma} to \newtheorem{lemma}[theo]{Lemma} Mar 28, 2011 at 22:18
  • This doesn't change anything, I fear. Mar 28, 2011 at 22:19
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    @darij grinberg: then, please post a minimal and complete version of your code, so that I can see where the problem is. Mar 28, 2011 at 22:21

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