Paul Smith wrote:
Thanks, Uwe. I did not know about amsthm package. It does nearly what I want, and what I want is explained in the example below.
See the attached example and the file amsthdoc.dvi on your computer.
regards Uwe
#LyX 1.3 created this file. For more info see http://www.lyx.org/ \lyxformat 221 \textclass article \begin_preamble \usepackage{amsthm}
\newtheoremstyle{paul}%
{\topsep} %space above
{\topsep} %space below
{\normalfont} %body font
{} %indent
{\rmfamily\bfseries} %head font
{} %point after head
{\newline} %space/command after heading
{} %head specification
\theoremstyle{paul}
\newtheorem{exa}{Exercise}
\newcommand{\beg}[2]{\begin{#1}[\textbf{#2}]}
\end_preamble
\language american
\inputencoding auto
\fontscheme default
\graphics default
\paperfontsize 12
\spacing single
\papersize a4paper
\paperpackage a4
\use_geometry 0
\use_amsmath 1
\use_natbib 1
\use_numerical_citations 0
\paperorientation portrait
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\defskip medskip
\quotes_language english
\quotes_times 2
\papercolumns 1
\papersides 1
\paperpagestyle default
\layout Standard
\begin_inset ERT
status Open
\layout Standard
\backslash
begin{exa}[Zarathustra]
\end_inset
\layout Standard
See amsthdoc.dvi!
\layout Standard
\begin_inset ERT
status Collapsed
\layout Standard
\backslash
end{exa}
\end_inset
\layout Standard
\begin_inset ERT
status Open
\layout Standard
\backslash
beg{exa}{Zarathustra}
\end_inset
\layout Standard
See amsthdoc.dvi!
\layout Standard
\begin_inset ERT
status Collapsed
\layout Standard
\backslash
end{exa}
\end_inset
\the_end
