--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc-src/IsarRef/Symbols.thy	Tue Aug 28 12:45:49 2012 +0200
@@ -0,0 +1,46 @@
+theory Symbols
+imports Base Main
+begin
+
+chapter {* Predefined Isabelle symbols \label{app:symbols} *}
+
+text {*
+  Isabelle supports an infinite number of non-ASCII symbols, which are
+  represented in source text as @{verbatim "\\"}@{verbatim "<"}@{text
+  name}@{verbatim ">"} (where @{text name} may be any identifier).  It
+  is left to front-end tools how to present these symbols to the user.
+  The collection of predefined standard symbols given below is
+  available by default for Isabelle document output, due to
+  appropriate definitions of @{verbatim "\\"}@{verbatim isasym}@{text
+  name} for each @{verbatim "\\"}@{verbatim "<"}@{text name}@{verbatim
+  ">"} in the @{verbatim isabellesym.sty} file.  Most of these symbols
+  are displayed properly in Proof~General and Isabelle/jEdit.
+
+  Moreover, any single symbol (or ASCII character) may be prefixed by
+  @{verbatim "\\"}@{verbatim "<^sup>"}, for superscript and @{verbatim
+  "\\"}@{verbatim "<^sub>"}, for subscript, such as @{verbatim
+  "A\\"}@{verbatim "<^sup>\<star>"}, for @{text "A\<^sup>\<star>"} the alternative
+  versions @{verbatim "\\"}@{verbatim "<^isub>"} and @{verbatim
+  "\\"}@{verbatim "<^isup>"} are considered as quasi letters and may
+  be used within identifiers.  Sub- and superscripts that span a
+  region of text are marked up with @{verbatim "\\"}@{verbatim
+  "<^bsub>"}@{text "\<dots>"}@{verbatim "\\"}@{verbatim "<^esub>"}, and
+  @{verbatim "\\"}@{verbatim "<^bsup>"}@{text "\<dots>"}@{verbatim
+  "\\"}@{verbatim "<^esup>"} respectively.  Furthermore, all ASCII
+  characters and most other symbols may be printed in bold by
+  prefixing @{verbatim "\\"}@{verbatim "<^bold>"} such as @{verbatim
+  "\\"}@{verbatim "<^bold>\\"}@{verbatim "<alpha>"} for @{text
+  "\<^bold>\<alpha>"}.  Note that @{verbatim "\\"}@{verbatim "<^bold>"}, may
+  \emph{not} be combined with sub- or superscripts for single symbols.
+
+  Further details of Isabelle document preparation are covered in
+  \chref{ch:document-prep}.
+
+  \begin{center}
+  \begin{isabellebody}
+  \input{syms}  
+  \end{isabellebody}
+  \end{center}
+*}
+
+end
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