# What are the parameters of Definition enviroment?

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 amsthm`to 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`.
More properly, `definition` is a theorem style defined by `amsthm`. –  egreg Dec 25 '13 at 14:37