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I'm trying to redefine Definition theoremstyle and I'm stuck trying to find a single webpage where I could look up the parameters of that style. I keep finding plain style, but that's not what I want. Help.

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the definition environment (lowercase; i'm not familiar with Definition) is one of three theorem-class environments (styles) defined by amsthm.sty. you should be able to find the parameters there, or texdoc amsthmto look at the user's guide.

amsthm also has a \newtheoremstyle facility, with which you can "roll your own". this is also described in the amsthm user's guide.

to view the documented source (in amsclass.dtx). the "human readable" version is amsclass.pdf, which can be accessed by texdoc amsclass.

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More properly, definition is a theorem style defined by amsthm. – egreg Dec 25 '13 at 14:37
@egreg -- thanks. (i'm wrapped up in preparing knuth's periodic bug review, and not thinking straight.) – barbara beeton Dec 25 '13 at 14:53
@barbarabeeton: what is knuth's periodic bug review? Isn't it all about TeX being bug-free? – Dror Dec 25 '13 at 16:05
@Dror -- take a look at knuth's web page for computers & typesetting, under "errata". it gives the schedule of the periodic review. just because there are very few (and ever more and more obscure) bugs or glitches doesn't mean that people don't still think they have found something, so the task of evaluating and pre-sorting the collection actually entails quite a bit of correspondence and editing, so that what gets delivered is "minimum (non)working examples". – barbara beeton Dec 25 '13 at 16:49

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