In mathematics, a lattice is a partially ordered set in which every two elements x and y have a unique supremum (also called a least upper bound, join, or x /\ y) and a unique infimum (also called a greatest lower bound, meet, or x \/ y).

This package provide type-classes for different lattice types, as well as a class for the partial order.


2.0.1 (2019-07-22)

  • Add (PartialOrd a, PartialOrd b) => PartialOrd (Either a b) instance

2 (2019-04-17)

  • Reduce to three classes (from six): Lattice, BoundedMeetSemiLattice BoundeJoinSemiLattice. The latter two names are kept to help migration.
  • Remove Algebra.Enumerable module. Use universe package.
  • Drop GHC-7.4.3 support (broken ConstraintKinds)
  • Move Algebra.Lattice.Free to Algebra.Lattice.Free.Final
  • Add concrete syntax Algebra.Lattice.Free and Algebra.Heyting.Free using LJT-proof search for Eq and PartialOrd
  • Change PartialOrd [a] to be leq = isSubsequenceOf (2019-07-05)

  • Allow newer dependencies, update cabal file

1.7.1 (2018-01-29)

1.7 (2017-10-01)

  • HashMap instances changed
  • PartialOrd Meet and Join
  • PartialOrd () and Void
  • BoundedLattice (HashSet a)
  • PartialOrd [a] (leq = isInfixOf)

1.6.0 (2017-06-26)

  • Correct PartialOrd Map and IntMap instances
  • Add Lattice instance for containers types.
  • Change meets1 and joins1 to use Foldable1
  • Add comparable to PartialOrd
  • Add Algebra.Lattice.Free module
  • Add Divisibility lattice.
  • Fix Lexicographic.

1.5.0 (2015-12-18)

  • Move PartialOrd (k -> v) instance into own module
  • Const and Identity instances
  • added fromBool
  • Add Lexicographic, Ordered and Op newtypes

1.4.1 (2015-10-26)

  • MINIMAL pragma in with GHC 7.8
  • Add DEPREACTED pragma for meet and join, use infix version \/ and /\

1.4 (2015-09-19)

  • Infix operators
  • meets and joins generalised to work on any Foldable
  • Deprecate Algebra.Enumerable, use universe package
  • Add Applicative and Monad typeclasses to Dropped, Lifted and Levitated
  • Add Semigroup instance to Join and Meet
  • Add instances for (), Proxy, Tagged and Void

1.3 (2015-05-18)

  • relaxed constraint for BoundedLattice (Levitated a)
  • added instances to Dropped, Levitated and Lifted:
    • from base
    • NFData
    • Hashable
  • added HashSet and HashMap lattice instances