moved theorem tags from Drule to PureThy;
replaced kind attribute by kind string;
tuned name_multi: index > 1 only;
added note_thmss_qualified (from Isar/locale.ML);
\index{model checking example|(}%
\index{lfp@{\texttt{lfp}}!applications of|see{CTL}}
\input{CTL/document/Base.tex}
\input{CTL/document/PDL.tex}
\input{CTL/document/CTL.tex}
\index{model checking example|)}