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consider the following code:




Normal theorem.
Normal proof.


\item Some remark.
Proof for that remark. %!!!
\item Other information.


I want to introduce (best via newenvironment) a new kind of proof environment that I can use for remarks and that does not have additional vertical space before and after the proof other than the usual vertical line spacing.

So, the above example looks like

enter image description here

and I want to get rid of the extra space around the second Beweis.

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Welcome to TeX.SX! Note that you don't have to sign with your name since it automatically appears in the lower right corner of your post. The preferred way to express thanks is through upvoting answers that help you. – percusse Mar 28 '12 at 11:26
up vote 6 down vote accepted

You can define a new environment, duplicating proof:

  \normalfont \partopsep=\z@skip \topsep=\z@skip

Now you can input the "inner" proof as

This is a proof without additional vertical space
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