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No problem. I have done some more hunting about this and have found out that the machinery that is doing all of this nice formatting is an .inc file. It sets the styles and all that. I am not sure how they all work but I'll try to test some stuff out. I really would just like to have lyx ...

I think I know what you are saying. Define a new environment that just wraps another environment inside the hrule's? I tried that by just blindly modifying what you wrote and pasting only

\singlerule{ruleddef}{\noindent\hrulefill\begin{defn}}{\end{defn}\noindent\hrulefill}


into the preamble. I ...

Great forum here, I am a newb so bear with me. I am trying to figure out how to add a horizontal rule before and after the example environment (in the book (AMS) class). So ideally it would look something like

--------------------------
Example 1.1

blah blah
blah blah
--------------------------

I ...