Best Free and Open Source Proof Assistants

LISA (LISA Is Sets Automated) – proof assistant

LISA (LISA Is Sets Automated) is a proof assistant based on first-order logic sequent calculus and set theory.

It provides a trusted kernel for checking proofs, together with a domain-specific language and supporting utilities for developing formal proofs, tactics, and mathematical theories.

This is free and open source software.

Key Features

  • Based on first-order logic, sequent calculus, and set theory.
  • Trusted kernel verifies all accepted theorems and proofs.
  • Formalisation of first-order logic.
  • Proofs formalised through sequent calculus.
  • Domain-specific language for writing proofs and mathematical developments.
  • Supports development of proof tactics.
  • Parser and printer for proofs and formulas.
  • Provides unification algorithms.
  • Includes a mathematical library with set theory developments.

Website: github.com/epfl-lara/lisa
Support:
Developer: Laboratory for Automated Reasoning and Analysis (LARA)
License: Apache License 2.0

LISA is written in Scala. Learn Scala with our recommended free books and free tutorials.


Related Software

Proof Assistants
Rocq ProverFormal proof management system
IsabelleGeneric proof assistant; express mathematical formulas in a formal language
LeanProgramming language and theorem prover
AgdaInteractive system for writing and checking proofs
F*Functional language for verified programs with dependent refinement types
HOL4Interactive higher-order logic environment for rigorous theorem development
AyaDependently typed language for formalisation and certified programming
LambdapiLogical framework for defining and checking expressive type systems
HOL LightLightweight higher-order logic system with a small trusted kernel
PVSSpecification and verification suite for analysing complex systems
LISAScala-based platform for formal mathematics and automated reasoning

Read our verdict in the software roundup.


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