Originally, it was commented out, since it collided with the built-in
proof environment. Renamed it to "myproof" instead.
%%% An environment for proofs
-%%% FIXME %%% \newenvironment{proof}{
-%%% FIXME %%% \par\medskip\noindent
-%%% FIXME %%% \textit{Proof}.
-%%% FIXME %%% }{
-%%% FIXME %%% \newline
-%%% FIXME %%% \rightline{$\square$} % or \SquareCastShadowBottomRight from bbding package
-%%% FIXME %%% }
+\newenvironment{myproof}{
+ \par\medskip\noindent
+ \textit{Proof}.
+}{
+\newline
+\rightline{$\qedsymbol$}
+}
%%% An environment for typesetting of program code and input/output
%%% of programs. (Requires the fancyvrb package -- fancy verbatim.)