# semigroups: Haskell 98 semigroups

[ algebra, bsd3, data, data-structures, library, math ] [ Propose Tags ]

Haskell 98 semigroups

In mathematics, a semigroup is an algebraic structure consisting of a set together with an associative binary operation. A semigroup generalizes a monoid in that there might not exist an identity element. It also (originally) generalized a group (a monoid with all inverses) to a type where every element did not have to have an inverse, thus the name semigroup.

Versions 0.1.0, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.4.1, 0.3.4.2, 0.4.0, 0.5.0, 0.5.0.1, 0.5.0.2, 0.6, 0.6.1, 0.7.0, 0.7.1, 0.7.1.1, 0.7.1.2, 0.8, 0.8.0.1, 0.8.2, 0.8.3, 0.8.3.1, 0.8.3.2, 0.8.4, 0.8.4.1, 0.8.5, 0.9, 0.9.1, 0.9.2, 0.10, 0.11, 0.12, 0.12.0.1, 0.12.1, 0.12.2, 0.13, 0.13.0.1, 0.14, 0.15, 0.15.1, 0.15.2, 0.15.3, 0.15.4, 0.16, 0.16.0.1, 0.16.1, 0.16.2, 0.16.2.1, 0.16.2.2, 0.17, 0.17.0.1, 0.18, 0.18.0.1, 0.18.1, 0.18.2, 0.18.3, 0.18.4 base (>=4 && <4.5), containers (>=0.3 && <0.5) [details] BSD-3-Clause Copyright (C) 2011 Edward A. Kmett Edward A. Kmett Edward A. Kmett Revision 1 made by HerbertValerioRiedel at Mon Dec 29 18:14:54 UTC 2014 Algebra, Data, Data Structures, Math http://github.com/ekmett/semigroups/ head: git clone git://github.com/ekmett/semigroups.git by EdwardKmett at Mon Aug 15 01:34:59 UTC 2011 Debian:0.18.0.1, Fedora:0.18.3, FreeBSD:0.16.2.2, LTSHaskell:0.18.4, NixOS:0.18.4, Stackage:0.18.4, openSUSE:0.18.4 384726 total (524 in the last 30 days) 2.75 (votes: 8) [estimated by rule of succession] λ λ λ Docs uploaded by userBuild status unknown Hackage Matrix CI

[Index]

## Flags

NameDescriptionDefaultType
derivedatatypeable

DeriveDataTypeable available

EnabledAutomatic

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

## Downloads

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'.

#### Maintainer's Corner

For package maintainers and hackage trustees