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In theory if I'd used a different document class I could have done it easily using one of the fancier theorem packages. Since I didn't want to do that, I used \qedhere where possible and just put up with the misplaced symbol everywhere else. Hacky, irritating, and contrary to the principles of LaTeX ...

I've got some whitespace by using \par\bigskip before \footnotesize in the theorem and lemma environments (in fact, I removed \footnotesize from those, because I didn't want the text that small). I've added \raggedbottom to avoid massive whitespace issues. I've decided to put up with the uneven ...

Perhaps post an example lyx file as attachment.
When I use LyX with amsmath activated, then amsmath and amssymb are loaded but not amsthm. ntheorem will be loaded later with the user specified LaTeX commands.

Perhaps it's the amsmath.inc bits that are included from amsbook.layout that ...

Is that compatible with the book (AMS) class that I'm using?
ntheorem works with amsmath if you use the amsmath option, for instance:
\usepackage[amsmath,thmmarks]{ntheorem}

That didn't work - it seems that LyX's implementation of amsmath automatically includes amsthm, and that this occurs ...

welcome to the forum!

Thanks! :)

It's not a complete preamble. The document class (ok, amsbook) and it's options are missing, you are using the @-Symbol what means there should be \makeatletter somewhere. Or it's not a common tex-document, it may be a .sty file?

Sorry, I should have mentioned ...

Greetings,

I'm using book (AMS) to transcribe a book, and would like to make a few modifications to get the style of output I'm aiming for. I've had some success already, I (hopefully) now just need to tweak things to get it right.

First, for reference, here's my current preamble:

\usepackage ...