renamed sprop "prop#" to "prop'" -- proper identifier;
eliminated spurious symbolic string bindings (logic, any etc.);
hardwired special "prop" vs. "prop'" conversion;
tuned;
\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|)}