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I need to fix a precise linespread in a document I'm writing, but only in the plain sections of the document. In other words, I'm writing math and in the text there are a lot of environments (theorem, proposition, definition, etc): is there a way to make linespread work only OUTSIDE these environments, without inserting a command every time I use an environment?

I guess I could redefine all the environments at the beginning of my document, is there an easier way to do this?

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    Perhaps use etoolbox and setspace and write in your preamble things like: \AtBeginEnvironment{mytheorem}{\singlespacing}, or \BeforeBeginEnvironment{mytheorem}{\singlespacing}, and \AtEndEnvironment{mytheorem}{\linespread{…}}, or \AfterEndEnvironment{mytheorem}{\linespread{…}}. – Bernard Feb 26 '15 at 18:27
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    Perfect! May I suggest you should use \setspace{…} rather than \linespread{…} as this kind of modifications have side effects that setspacetakes into account (cf. l2tabu). – Bernard Feb 26 '15 at 18:51
  • @Bernard: I think you should make an answer out of your comment ;-) – user31729 Feb 28 '15 at 19:16
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Use etoolbox and setspace and write in your preamble things like:

\AtBeginEnvironment{mytheorem}{\singlespacing} 

or \BeforeBeginEnvironment{mytheorem}{\singlespacing} (not tested which one works — see the documentation of etoolbox).

and restore the document global spacing with:

\AtEndEnvironment{mytheorem}{\linespread{…}} 

or \AfterEndEnvironment{mytheorem}{\linespread{…}}

Comment aside, you should probably use the \setspace{…} command (from the homonymous package) rather than \linespread, as there are a number of side effects the package takes care of. See the details in l2tabu, §1.4.

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