The semigroups package

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

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.


[Skip to Readme]

Properties

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
Change log CHANGELOG.markdown
Dependencies base (>=2 && <4.9), bytestring (>=0.9 && <1), containers (>=0.3 && <0.6), deepseq (>=1.1 && <1.5), ghc-prim, hashable (>=1.1 && <1.3), nats (>=0.1 && <2), text (>=0.10 && <2), unordered-containers (==0.2.*) [details]
License BSD3
Copyright Copyright (C) 2011-2014 Edward A. Kmett
Author Edward A. Kmett
Maintainer Edward A. Kmett <ekmett@gmail.com>
Category Algebra, Data, Data Structures, Math
Home page http://github.com/ekmett/semigroups/
Bug tracker http://github.com/ekmett/semigroups/issues
Source repository head: git clone git://github.com/ekmett/semigroups.git
Uploaded Fri Jan 23 05:36:18 UTC 2015 by EdwardKmett
Updated Tue Jan 26 22:15:49 UTC 2016 by HerbertValerioRiedel to revision 1
Distributions Arch:0.18.3, Debian:0.18.0.1, Fedora:0.18.2, FreeBSD:0.16.2.2, LTSHaskell:0.18.3, NixOS:0.18.3, Stackage:0.18.3, Tumbleweed:0.18.2
Downloads 317577 total (3031 in the last 30 days)
Rating 2.5 (6 ratings) [clear rating]
  • λ
  • λ
  • λ
Status Docs available [build log]
Last success reported on 2015-01-23 [all 1 reports]
Hackage Matrix CI

Modules

[Index]

Flags

NameDescriptionDefaultType
hashable

You can disable the use of the hashable package using -f-hashable.

Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

If disabled we will not supply instances of Hashable

Note: -f-hashable implies -f-unordered-containers, as we are necessarily not able to supply those instances as well.

EnabledManual
bytestring

You can disable the use of the bytestring package using -f-bytestring.

Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

EnabledManual
containers

You can disable the use of the containers package using -f-containers.

Disabing this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

EnabledManual
deepseq

You can disable the use of the deepseq package using -f-deepseq.

Disabing this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

EnabledManual
text

You can disable the use of the text package using -f-text.

Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

EnabledManual
unordered-containers

You can disable the use of the unordered-containers package using -f-unordered-containers.

Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

EnabledManual

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

Downloads

Maintainer's Corner

For package maintainers and hackage trustees


Readme for semigroups-0.16.1

[back to package description]

semigroups

Build Status

Haskellers are usually familiar with monoids. A monoid has an appending operation <> or mappend and an identity element mempty. A Semigroup has an append <>, but does not require an mempty element. A Monoid can be made a Semigroup with just instance Semigroup MyMonoid

More formally, 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.

Semigroups appear all over the place, except in the Haskell Prelude, so they are packaged here.

Contact Information

Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on irc.freenode.net.

-Edward Kmett