The hol package

[ Tags: library, logic, mit, program ] [ Propose Tags ]

This package implements a higher order logic kernel with OpenTheory support.

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Versions 1.0, 1.1, 1.2
Dependencies base (>=4.0 && <5.0), bytestring (==0.9.*), containers (==0.5.*), filepath (==1.3.*), parsec (==3.1.*), pretty (==1.1.*), process (==1.2.*), QuickCheck (==2.4.*), text (==0.11.*), transformers (==0.3.*) [details]
License MIT
Author Joe Leslie-Hurd <>
Maintainer Joe Leslie-Hurd <>
Category Logic
Source repository head: git clone git://
Uploaded Tue Oct 3 04:59:21 UTC 2017 by JoeHurd
Distributions NixOS:1.1
Executables hol-pkg
Downloads 144 total (36 in the last 30 days)
Rating 0.0 (0 ratings) [clear rating]
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Status Docs not available [build log]
All reported builds failed as of 2017-10-03 [all 3 reports]
Hackage Matrix CI


  • HOL
    • HOL.Const
    • HOL.Data
    • HOL.Name
    • HOL.OpenTheory
      • HOL.OpenTheory.Article
      • HOL.OpenTheory.Interpret
      • HOL.OpenTheory.Package
    • HOL.Parse
    • HOL.Print
    • HOL.Rule
    • HOL.Sequent
    • HOL.Subst
    • HOL.Term
    • HOL.TermAlpha
    • HOL.TermData
    • HOL.Theory
    • HOL.Thm
    • HOL.Type
    • HOL.TypeData
    • HOL.TypeOp
    • HOL.TypeSubst
    • HOL.TypeVar
    • HOL.Var


Maintainer's Corner

For package maintainers and hackage trustees

Readme for hol-1.2

[back to package description]

The hol package

The hol package is a Haskell library that implements a higher order logic kernel. It can read proof files in OpenTheory format, and includes a pretty-printer compatible with the standard theory library.

This software is released under the MIT License.


Installing the hol package requires cabal:

git clone
cd hol
cabal install


Use cabal to run the test suite:

cabal test


The hol package contains an executable called hol-pkg, which is run as follows:

Usage: hol-pkg INPUT
where INPUT is one of the following forms:     : a proof article file
  FILE.thy     : a theory package file
  NAME-VERSION : a specific version of an installed theory package
  NAME ...     : the latest installed version of a list of packages

The hol-pkg program reads the INPUT to generate a set of theorems, which are pretty-printed to standard output together with the symbols they contain. For example,

hol-pkg unit

reads the latest installed version of the unit theory package to generate a set of 5 theorems, resulting in the following output:

3 type operators: (->) bool unit
6 constants: (=) (!) (==>) (?) (?!) ()
5 theorems:
  |- !v. v = ()
  |- !f g. f = g
  |- !e. ?fn. fn () = e
  |- !e. ?!fn. fn () = e
  |- !p. p () ==> !x. p x


Before starting, make sure the GHC system and the GHC text, transformers and parsec libraries are installed with profiling support. On a Debian system the following command installs them:

 apt-get install ghc-prof libghc-text-prof libghc-transformers-prof libghc-parsec3-prof

Next use cabal to install the other dependent libraries with profiling support:

cabal sandbox init
cabal configure --enable-library-profiling --enable-profiling --enable-benchmarks
cabal install --only-dependencies --enable-library-profiling

Build the hol package library and benchmark program:

cabal configure --enable-library-profiling --enable-profiling --enable-benchmarks
cabal build

Use the opentheory tool to create a benchmark file:

 opentheory info --article -o base

Then use cabal to run the benchmark:

cabal bench

The time and memory allocation profile of the program can be viewed in text format:


Alternatively the memory allocation profile can be viewed as a graph:

hp2ps -e8in -c hol-profile.hp
xpdf hol-profile.pdf