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\chapter{Basic Concepts}\label{ch:basics}
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Isabelle/Isar offers two main improvements over classic Isabelle:
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\begin{enumerate}
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\item A new \emph{theory format}, often referred to as ``new-style theories'',
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supporting interactive development with unlimited undo operation.
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\item A formal \emph{proof language} language designed to support
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\emph{intelligible} semi-automated reasoning. Rather than putting together
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tactic scripts, the author is enabled to express the reasoning in way that
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is close to mathematical practice.
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\end{enumerate}
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The Isar proof language is embedded into the new theory format as a proper
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sub-language. Proof mode is entered by stating some $\THEOREMNAME$ or
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$\LEMMANAME$ at the theory levels, and left with the final end of proof. Some
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theory extension mechanisms require proof as well, such as the HOL
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$\isarkeyword{typedef}$.
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New-style theory files may still be associated with an ML file consisting of
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plain old tactic scripts. Generally, migration between the two formats is
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made relatively easy, and users may start to benefit from interactive theory
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development even before they have any idea of the Isar proof language.
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\section{The Isar proof language}
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This rather important section has not been written yet! Refer to
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\cite{Wenzel:1999:TPHOL} for the time being.
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\subsection{Commands}
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\subsubsection{Isar primitives}
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\subsubsection{Derived elements}
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\subsection{Methods}
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\subsection{Attributes}
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%%% Local Variables:
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%%% mode: latex
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%%% TeX-master: "isar-ref"
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%%% End:
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