src/ZF/README
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Wed, 15 Mar 1995 11:25:24 +0100
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		ZF: Zermelo-Fraenkel Set Theory
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This directory contains the Standard ML sources of the Isabelle system for
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ZF Set Theory.  It is loaded upon FOL, not Pure Isabelle.  Important files
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include
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Makefile -- compiles the files under Poly/ML or SML of New Jersey.  Can also
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run all the tests described below.
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ROOT.ML -- loads all source files.  Enter an ML image containing FOL and
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type: use "ROOT.ML";
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Coind -- subdirectory containing a large example of proof by co-induction,
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originally due to Robin Milner and Mads Tofte.  To execute, enter an ML image
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containing ZF and type:   use "Coind/ROOT.ML";
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IMP -- subdirectory containing a semantics equivalence proof between
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operational and denotational definitions of a simple programming language.
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To execute, enter an ML image containing ZF and type:   use "IMP/ROOT.ML";
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ex -- subdirectory containing examples.  To execute them, enter an ML image
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containing ZF and type:    use "ex/ROOT.ML";
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Isabelle/ZF formalizes the greater part of elementary set theory, including
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relations, functions, injections, surjections, ordinals and cardinals.
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Results proved include Cantor's Theorem, the Recursion Theorem, the
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Schroeder-Bernstein Theorem, and (assuming AC) the Wellordering Theorem.
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Isabelle/ZF also provides theories of lists, trees, etc., for formalizing
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computational notions.  It supports inductive definitions of
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infinite-branching trees for any cardinality of branching.
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Useful references for Isabelle/ZF:
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	Lawrence C. Paulson,
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	Set theory for verification: I. From foundations to functions.
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	J. Automated Reasoning 11 (1993), 353-389.
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	Lawrence C. Paulson,
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	Set theory for verification: II. Induction and recursion.
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	Report 312, Computer Lab (1993).
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	Lawrence C. Paulson,
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	A fixedpoint approach to implementing (co)inductive definitions.  
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	In: A. Bundy (editor),
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	CADE-12: 12th International Conference on Automated Deduction,
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	(Springer LNAI 814, 1994), 148-161.
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Useful references on ZF set theory:
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	Paul R. Halmos, Naive Set Theory (Van Nostrand, 1960)
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	Patrick Suppes, Axiomatic Set Theory (Dover, 1972)
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	Keith J. Devlin,
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	Fundamentals of Contemporary Set Theory (Springer, 1979)
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	Kenneth Kunen
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	Set Theory: An Introduction to Independence Proofs
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	(North-Holland, 1980)
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$Id$