twee: An equational theorem prover

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Twee is an experimental equational theorem prover based on Knuth-Bendix completion.

Given a set of equational axioms and a set of equational conjectures it will try to prove the conjectures. It will terminate if the conjectures are true but normally fail to terminate if they are false.

The input problem should be in TPTP format (see https://www.tptp.org). You can use types and quantifiers, but apart from that the problem must be equational.


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Flags

Manual Flags

NameDescriptionDefault
static

Build a static binary.

Disabled
parallel

Build a special parallel version of Twee.

Disabled
rtsopts

Enable -rtsopts (e.g. for setting maximum memory use.)

Disabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

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Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.

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Versions [RSS] 0.1, 2.0, 2.1, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.2, 2.3, 2.3.1, 2.4, 2.4.1, 2.4.2, 2.5, 2.6.1, 2.7.1
Dependencies ansi-terminal (>=0.9), async, base (<5), binary, bytestring, containers, hashable, jukebox (==0.5.15), pretty, process, split, symbol, twee-lib (==2.7.1), unix [details]
License BSD-3-Clause
Author Nick Smallbone
Maintainer nicsma@chalmers.se
Uploaded by NickSmallbone at 2026-08-27T18:06:09Z
Revised Revision 1 made by NickSmallbone at 2026-08-27T18:24:47Z
Category Theorem Provers
Home page https://twee.smallbone.se
Source repo head: git clone https://codeberg.org/nick8325/twee -b main
Distributions
Reverse Dependencies 1 direct, 0 indirect [details]
Executables parallel-twee, twee-lpo, twee
Downloads 6069 total (24 in the last 30 days)
Rating (no votes yet) [estimated by Bayesian average]
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Status Docs not available [build log]
Last success reported on 2026-08-27 [all 1 reports]

Readme for twee-2.7.1

[back to package description]

This is twee, an equational theorem prover.

The version in this git repository is likely to be unstable! To install the latest stable version, run:

cabal install twee

If you have LLVM installed, you can get a slightly faster version by running:

cabal install twee -fllvm

If you really want the latest unstable version, run cabal install src/ . in this repository.

Afterwards, run twee nameofproblem.p. The problem should be in TPTP format (http://www.tptp.org). You can find a few examples in the examples directory. All axioms and conjectures must be equations, but you can freely use quantifiers. If it succeeds in proving your problem, twee will print a human-readable proof.

For the official manual, see https://twee.smallbone.se.