doc-src/IsarRef/basics.tex
 author wenzelm Thu Oct 21 17:42:21 1999 +0200 (1999-10-21) changeset 7895 7c492d8bc8e3 parent 7466 7df66ce6508a child 7981 5120a2a15d06 permissions -rw-r--r--
updated;
     1

     2 \chapter{Basic Concepts}\label{ch:basics}

     3

     4 \section{Isabelle/Isar theories}

     5

     6 Isabelle/Isar offers two main improvements over classic Isabelle:

     7 \begin{enumerate}

     8 \item A new \emph{theory format}, occasionally referred to as new-style

     9   theories'', supporting interactive development and unlimited undo operation.

    10 \item A \emph{formal proof document language} designed to support intelligible

    11   semi-automated reasoning.  Instead of putting together unreadable tactic

    12   scripts, the author is enabled to express the reasoning in way that is close

    13   to mathematical practice.

    14 \end{enumerate}

    15

    16 The Isar proof language is embedded into the new theory format as a proper

    17 sub-language.  Proof mode is entered by stating some $\THEOREMNAME$ or

    18 $\LEMMANAME$ at the theory level, and left again with the final conclusion

    19 (e.g.\ via $\QEDNAME$).  A few theory extension mechanisms require proof as

    20 well, such as the HOL $\isarkeyword{typedef}$ which demands non-emptiness of

    21 the representing sets.

    22

    23 New-style theory files may still be associated with an ML file consisting of

    24 plain old tactic scripts.  There is no longer any ML binding generated for the

    25 theory and theorems, though.  ML functions \texttt{theory}, \texttt{thm}, and

    26 \texttt{thms} retrieve this information \cite{isabelle-ref}.  Nevertheless,

    27 migration between classic Isabelle and Isabelle/Isar is relatively easy.  Thus

    28 users may start to benefit from interactive theory development even before

    29 they have any idea of the Isar proof language.

    30

    31 \begin{warn}

    32   Currently Proof~General does \emph{not} support mixed interactive

    33   development of classic Isabelle theory files and tactic scripts, together

    34   with Isar documents at the same time.  The \texttt{isa}'' and

    35   \texttt{isar}'' versions of Proof~General are handled as two different

    36   theorem proving systems, only one of these may be active.

    37 \end{warn}

    38

    39 Porting of existing tactic scripts is best done by running two separate

    40 Proof~General sessions, one for replaying the old script and the other for the

    41 emerging Isabelle/Isar document.

    42

    43

    44 \section{The Isar proof language}

    45

    46 Sorry, this important section has not been written yet!  Refer to

    47 \cite{Wenzel:1999:TPHOL} for the time being.

    48

    49 \subsection{Commands}

    50

    51 \subsubsection{Isar primitives}

    52

    53 \subsubsection{Derived elements}

    54

    55

    56 \subsection{Methods}

    57

    58 \subsection{Attributes}

    59

    60 %%% Local Variables:

    61 %%% mode: latex

    62 %%% TeX-master: "isar-ref"

    63 %%% End: