doc-src/TutorialI/CTL/ctl.tex

added nat as instance of new wellorder axclass

\index{CTL|(}
\index{lfp@{\texttt{lfp}}!applications of|see{CTL}}
\input{CTL/document/Base.tex}
\input{CTL/document/PDL.tex}
\input{CTL/document/CTL.tex}
\index{CTL|)}