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I am writing my thesis and I am using a template that has stuff like:

% Theorem definition
\newtheorem{theorem}{Theorem}
\counterwithin{theorem}{chapter}

for a bunch of environments (corollary, definition, example, lemma ,etc.).

I would like to know if I can modify or create new environments such that the text is not in italic, and there is always a symbol (like \qed) at the end of all these environments, to mark where it ends.

The italic font is nice, except when you mix math and then all looks italic and wonder if an a is an a or a math symbol for an object a...

Thanks

excalibur1491
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    Welcome to TeX.SX! Italic for theorem statements is a very old and established tradition. About end symbols: I'm not sure they are necessary, as the start and ending of a statement are clear (because of the italic). Sometimes examples have an end symbol like proofs. – egreg Feb 22 '18 at 10:35
  • But isn't it annoying to have math symbols on the middle of definitions that are in italic? I have the sentence "A literal is a variable or the negation of a variable. That is, $a$ and $\lnot a$ are the literals of variable $a$". I just find it annoying to read. I know I can change the name of the variable, but i'm just 2 pages into my thesis and Im sure its going to happen again. Any elegant suggestion to make this look nice? I would like to keep the italics, but removing them was the only idea that ocurred to me. – excalibur1491 Feb 22 '18 at 10:39
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    I don't find it annoying. You'll get used to it. Anyhow, this is something you can decide later, provided you structure your document according to the standard guidelines. – egreg Feb 22 '18 at 10:43
  • Fair enough. In my papers I always had that and it annoyed me a bit, but the template was fixed. I though maybe choosing this time as it's my thesis. But maybe you are right. As for the symbol at the end, would there be a way of automating it for the Examples/Proof? (I always did it in my papers, but I'm sure in a thesis I'll forget it in at least 20% of them...) – excalibur1491 Feb 22 '18 at 10:44
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    See https://tex.stackexchange.com/questions/16453/denoting-the-end-of-example-remark – egreg Feb 22 '18 at 10:46
  • Very often, wheras theorems and other to-be-proved statements are in italic, definitions are in upshape. – Bernard Feb 22 '18 at 10:46

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