README
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		     ISABELLE-93 DISTRIBUTION DIRECTORY
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ISABELLE-93 IS INCOMPATIBLE WITH EARLIER VERSIONS.  PLEASE CONSULT THE
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DOCUMENTATION.
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This directory contains the complete Isabelle system.  To build and test the
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entire system, including all object-logics, use the shell script make-all.
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Pure Isabelle and each of the object-logics can be built separately using the
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Makefiles in the respective directories; read them for more information.
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				THE MAKEFILES
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The Makefiles can use two different Standard ML compilers: Poly/ML version
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2.03 or later (from Abstract Hardware Ltd) and Standard ML of New Jersey
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(Version 0.93 or later).  Poly/ML is a commercial product and costs money,
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but it is reliable and its database system is convenient for interactive
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work.  SML of New Jersey requires lots of memory and disc space, but it is
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free and its code sometimes runs faster.  Both compilers are perfectly
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satisfactory for running Isabelle.
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The Makefiles and make-all use enviroment variables that you should set
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according to your site configuration.
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ISABELLEBIN is the directory to hold Poly/ML databases or New Jersey ML
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images.  When using Poly/ML, ISABELLEBIN must be an absolute pathname (one
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starting with "/").
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ML_DBASE is an absolute pathname to the initial Poly/ML database (not
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required for New Jersey ML).
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ISABELLECOMP is the ML compiler, typically "poly -noDisplay" or "sml".  If
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ISABELLECOMP begins with the letters "poly" then the Makefiles assume that
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it is Poly/ML; if it begins with the letters "sml" then they assume
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Standard ML of New Jersey.  
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If a Poly/ML session fails with the message "Run out of store" then you
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have used up the entire heap.  If your tactic is not in a loop, allocating
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more heap at startup should correct the problem.  For instance, "poly -h
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15000" allocates sufficient heap space to rebuild all Isabelle examples.
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			 STRUCTURE OF THIS DIRECTORY
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The directory Pure containes pure Isabelle, which has no object-logic.
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Other important files include...
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  COPYRIGHT   		Copyright notice and Disclaimer of Warranty
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  make-all		shell script for building entire system
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  change_simp		shell script to help convert sources to new simplifier
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  expandshort		shell script to expand "shortcuts" in files
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  prove_goal.el       	Emacs command to change proof format
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  xlisten		shell script for running Isabelle under X
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  teeinput		shell script to run Isabelle, logging inputs to a file
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  Pure			directory of source files for Pure Isabelle
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  Provers		directory of generic theorem provers
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xlisten sets up a window running Isabelle, with a separate small "listener"
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window, which keeps a log of all input lines.  This log is a useful record
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of a session.  If you are not running X windows, teeinput can still be used at
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least to record (if not to display) the log.
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The following subdirectories contain object-logics:
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  FOL 	  Natural deduction First-Order Logic (intuitionistic and classical)
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  FOLP 	  First-Order Logic with Proof terms
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  ZF	  Zermelo-Fraenkel set theory
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  CTT	  Constructive Type Theory
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  HOL	  Classical Higher-Order Logic
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  LK	  Classical first-order sequent calculus
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  Modal	  The modal logics T, S4, S43
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  LCF     Logic for Computable Functions (domain theory)
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  CCL	  Martin Coen's Classical Computational Logic
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  Cube	  Barendregt's Lambda Cube
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Object-logics include examples files in subdirectory ex or file ex.ML.
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These files can be loaded in batch mode.  The commands can also be
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executed interactively, using the windows on your workstation.  This is a
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good way to get started.
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Each object-logic is built on top of Pure Isabelle, and possibly on top of
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another object logic (like FOL or LK).  A database or binary called Pure is
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first created, then the object-logic is loaded on top.  Poly/ML extends
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Pure using its "make_database" operation.  Standard ML of New Jersey starts
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with the Pure core image and loads the object-logic's ROOT.ML.
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		HOW TO GET A STANDARD ML COMPILER
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To obtain Poly/ML, contact Mike Crawley <mjc@ahl.co.uk> at Abstract
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Hardware Ltd, The Howell Building, Brunel University, Uxbridge UB8 3PH,
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England.
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To obtain Standard ML of New Jersey, contact David MacQueen
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<dbm@com.att.research> at AT&T Bell Laboratories, 600 Mountain Avenue,
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Murray Hill, NJ 07974, USA.  This compiler is available by FTP.  Connect to
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research.att.com; login as anonymous with your userid as password; set
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binary mode; transfer files from the directory dist/ml.
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Please report any problems you encounter.  While we shall try to be helpful,
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we can accept no responsibility for the deficiences of Isabelle and their
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consequences.
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Lawrence C Paulson		E-mail: lcp@cl.cam.ac.uk
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Computer Laboratory 		Phone: +44-223-334600
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University of Cambridge 	Fax:   +44-223-334748 
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Pembroke Street 
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Cambridge CB2 3QG 
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England
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Tobias Nipkow			E-mail: nipkow@informatik.tu-muenchen.de
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Institut fuer Informatik	Phone: +49-89-2105-2690
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T. U. Muenchen			Fax:   +49-89-2105-8183
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D-80290 Muenchen
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Germany
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Last updated 5 November 1993