| Directory > Science > Math > Logic and Foundations > Software Proof General
Comprehensive Gnu-Emacs and XEmacs interface for several theorem provers including Coq, Isabelle,
Lego, and Phox.
http://proofgeneral.inf.ed.ac.uk
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Ludwig
Application that draws truth-tables for propositional logic formulae of any complexity and amount
of variables. Available for free download and web use.
http://www.mintlogic.com/ludwig/
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VeriFun
A semi-automated system for the verification of statements about programs written in a functional
programming language. The system is capable of following fully-automated routines for theorem
proving and hypotheses formation, as well as operating interactively when these reoutines fail.
http://www.informatik.tu-darmstadt.de/pm/verifun/
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DC Proof Online
New proof-writing software to teach the fundamentals of logic and proof. Enables users/students to
write error-free proofs by selecting rules of inference, axioms, etc. from convenient drop-down
menus. Includes tutorial and exercises.
http://www.dcproof.com
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DELORES
A forward-chaining reasoning engine for defeasible logic, a less expressive but more efficient
nonmonotonic logic.
http://www.dfki.uni-kl.de/~miller/delores/
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Paradox
A tool that processes first-order logic problems and tries to find finite-domain models for them;
written by Koen Claessen and Niklas Sörensson. Haskell and C++; free download under GPL.
http://www.cs.chalmers.se/~koen/paradox/
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llprover
A linear logic prover that searches a cut-free proof for the given two-sided sequent of first-order
linear logic.
http://bach.scitec.kobe-u.ac.jp/llprover/
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Gateway to Logic
A collection of web-based logic programs offering a number of logical functions: interactively or
automatically build proofs, check theorems, and operate on propositional logic formulae.
http://logik.phl.univie.ac.at/~chris/formular-uk.html
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Logic.xla
Creates truth tables, if-then, and if-and-only-if processor.
http://qfsys.com/Jim/iffproof.htm
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ACL2 Version 2.7
A programming language in which you can model computer systems and a tool to help prove properties
of those models. Available under GPL and runs on various platforms. Includes related download
links.
http://www.cs.utexas.edu/users/moore/acl2/
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Tree Proof Generator
An implementation of the semantic tableaux method for classical propositional and predicate logic,
written in JavaScript/DOM.
http://www.umsu.de/logik/trees
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Visual Turing
A graphical IDE for creating, running and debugging Turing machines. Freeware for Windows
95/98/NT/2000.
http://www.cheransoft.com/vturing/
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Church
Program understands the different types of lambda expressions, can extract lists of variables (both
free and bound) and subterms, and can simplify complicated by expression by means of application.
Uses Python.
http://www.alcyone.com/pyos/church/
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PVS
The PVS Specification and Verification System. Available for Sparc machines with Solaris 2 and
Intel x86 Machines with Linux compatible with Redhat 5 or later. Required is Emacs (version 19 or
later), recommended LaTeX and Tcl/Tk. Download by FTP.
http://pvs.csl.sri.com/
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LOOM
A language and environment for constructing intelligent applications. It is a research project in
the Artificial Intelligence research group at the University of Southern California's Information
Sciences Institute. The goal of the project is to develop and field advanced tools for knowledge
representation and reasoning in Artificial Intelligence.
http://www.isi.edu/isd/LOOM/LOOM-HOME.html
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ProofPower
A suite of tools supporting specification and proof in Higher Order Logic (HOL) and in Z notation.
http://www.lemma-one.com/ProofPower/index/
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Logic Software from CSLI
By Jon Barwise and John Etchemendy.
http://www-csli.stanford.edu/hp/Logic-software.html
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The Coq Project
Deals with effectively machine-checked formal mathematics. In practice, this includes the study of
mathematical formalisms well-suited for implementations, the implementations themselves and the use
of these for various applications. Focuses on software correctness proofs.
http://pauillac.inria.fr/coq/
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WinKE: A Proof Assistant for Teaching Logic
WinKE is an interactive proof assistant based on analytic tableaux, and designed for the teaching
of deductive reasoning. Ordering information is available at this site, as are academic papers on
the design of the software.
http://www.dcs.kcl.ac.uk/staff/endriss/WinKE/
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Isabelle
A generic theorem proving environment developed at Cambridge University (Larry Paulson) and TU
Munich (Tobias Nipkow). Includes logic, documentation and free download.
http://www.cl.cam.ac.uk/Research/HVG/Isabelle/
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MUltlog
Takes as input the specification of a finitely-valued first-order logic and produces a sequent
calculus, a natural deduction system, and clause formation rules for this logic.
http://www.logic.at/multlog/
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MUltseq
A generic sequent prover for propositional finitely-valued logics.
http://www.logic.at/multseq/
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Automated Reasoning Project
Web resource provided by research group. Includes access to software developed by the team,
coverering such projects as FINDER (Finite Domain Enumerator), MaGIC (Matrix Generator for
Implication Connectives) and Kripke (A theorem prover for the relevant logic LR).
http://cslab.anu.edu.au/ar/
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Database of Existing Mechanized Reasoning Systems
A list (>50 entries) of automatic resolution provers (like Otter), interactive provers (like
PVS) and other mechanized reasoning tools.
http://www-formal.stanford.edu/clt/ARS/systems.html
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Bertrand
First-order satisfiability checker and prover for the Macintosh.
http://www.humnet.ucla.edu/humnet/phil/grads/herzberg/Bertrand.html
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3TAP
Many-valued tableau-based theorem prover developed at the University of Karlsruhe. It can be
instantiated for arbitrary finitely-valued first-order logics, and it can handle equality
(two-valued), sorts, and non-clausal input.
http://i12www.ira.uka.de/~threetap/
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Theorem Provers
A list of (well-known) theorem provers on logic-server at the university of Muenchen. Good point to
start.
http://www.tcs.informatik.uni-muenchen.de/~matthes/logikserver/software.html
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PROTEIN
A PROver with a Theory Extension INterface. Theorem prover for first-order clause logic, written
in ECRC's Prolog-dialect ECLiPSe. Free download, documentation.
http://www.uni-koblenz.de/ag-ki/Implementierungen/Protein/
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SwitchMin Digital Circuit Minimizer
Tool for minimizing boolean logic functions.
http://incolor.inetnebr.com/double/softlib/switchmin.html
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LWB
Logics Workbench.
http://www.lwb.unibe.ch/
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