Proof assistant

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An interactive proof session in CoqIDE, showing the proof script on the left and the proof state on the right.

In computer science and mathematical logic, a proof assistant or interactive theorem prover is a software tool to assist with the development of formal proofs by man-machine collaboration. This involves some sort of interactive proof editor, or other interface, with which a human can guide the search for proofs, the details of which are stored in, and some steps provided by, a computer.

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[edit] Comparison

Name Latest version Developer(s) Implementation language Features
Higher-order logic Dependent types Small kernel Proof automation Proof by reflection Program extraction
ACL2 4.3 Matt Kaufmann and J Strother Moore Common Lisp No No No Unverified No
Agda 2.3.0 Ulf Norell (Chalmers) Haskell Yes Yes Yes No Partial N/A
Coq 8.3pl2 INRIA OCaml Yes Yes Yes Yes Yes Yes
Isabelle/HOL 2011-1 Larry Paulson (Cambridge), Tobias Nipkow (München) and Makarius Wenzel (Paris-Sud) Standard ML Yes No Yes Yes No Yes
LEGO 1.3.1 Randy Pollack (Edinburgh) Standard ML Yes Yes
NuPRL 5 Cornell University Common Lisp
PVS 5.0 SRI International Common Lisp Yes Partial No Unverified No
Twelf 1.7.1 Frank Pfenning and Carsten Schürmann Standard ML Yes Partial Unknown No No

[edit] Other proof assistants

  • ACL2 - a programming language, a first-order logical theory, and a theorem prover (with both interactive and automatic modes) in the Boyer-Moore tradition.
  • Coq - Which allows the expression of mathematical assertions, mechanically checks proofs of these assertions, helps to find formal proofs, and extracts a certified program from the constructive proof of its formal specification.
  • HOL theorem provers - A family of tools ultimately derived from the LCF theorem prover. In these systems the logical core is a library of their programming language. Theorems represent new elements of the language and can only be introduced via "strategies" which guarantee logical correctness. Strategy composition gives users the ability to produce significant proofs with relatively few interactions with the system. Members of the family include:
  • Jape - Java based.
  • LEGO
  • Matita - A light system based on the Calculus of Inductive Constructions.
  • MINLOG - A proof assistant based on first-order minimal logic.
  • Mizar - A proof assistant based on first-order logic, in a natural deduction style, and Tarski-Grothendieck set theory.
  • PhoX - A proof assistant based on higher-order logic which is eXtensible.
  • Prototype Verification System (PVS) - a proof language and system based on higher-order logic.
  • TPS and ETPS - Interactive theorem provers also based on simply-typed lambda calculus, but based on an independent formulation of the logical theory and independent implementation.
  • Typelab
  • Yarrow

[edit] User interface

A popular front-end for proof assistants is the Emacs-based Proof General, developed at the University of Edinburgh.

[edit] See also

[edit] References

[edit] External links

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