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Nov 19, 2010 at 14:02 comment added user2529 This is roughly #2 among the suggestions I wrote. Joel, How do you signal the end of the definition? Generally because theorems environments don't have a clear end point, but usually they are followed by a proof environment rather than some text.
Nov 19, 2010 at 13:33 comment added Joel David Hamkins Yes, there are numerous ways to automate it; the main thing is the effect: a formally set definition, but with a normal font.
Nov 19, 2010 at 13:24 comment added Andreas Blass I used to do this, until \theoremstyle became available (or, rather, until I became aware of it); it produces the same effect. In the old days, I had temporary environments like dftemp defined with \newtheorem (to handle the heading and numbering) and then I defined environments like df that invoke dftemp but add, at the beginning, \normalfont. De-italicizing is, in my opinion, good for definitions and absolutely essential for things like examples that may go on for several paragraphs.
Nov 19, 2010 at 12:04 history edited Joel David Hamkins CC BY-SA 2.5
deleted 7 characters in body
Nov 19, 2010 at 11:58 history answered Joel David Hamkins CC BY-SA 2.5