The semigroups package

[Tags:bsd3, library]

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.


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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
Change log CHANGELOG.markdown
Dependencies base (>=2 && <5), binary, bytestring (>=0.9 && <1), bytestring-builder (>=0.10.4 && <1), containers (>=0.3 && <0.6), deepseq (>=1.1 && <1.5), ghc-prim, hashable (>=1.1 && <1.3), nats (>=0.1 && <2), tagged (>=0.4.4 && <1), text (>=0.10 && <2), transformers (>=0.2 && <0.6), unordered-containers (==0.2.*) [details]
License BSD3
Copyright Copyright (C) 2011-2015 Edward A. Kmett
Author Edward A. Kmett
Maintainer Edward A. Kmett <ekmett@gmail.com>
Stability provisional
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 Thu Jun 23 12:54:05 UTC 2016 by ryanglscott
Distributions Arch:0.18.2, Debian:0.18.0.1, Fedora:0.16.0.1, FreeBSD:0.16.2.2, LTSHaskell:0.18.1, NixOS:0.18.1, Stackage:0.18.1
Downloads 233290 total (161 in the last 30 days)
Votes
4 []
Status Docs available [build log]
Last success reported on 2016-06-23 [all 1 reports]

Modules

[Index]

Flags

NameDescriptionDefaultType
hashableYou 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
binaryYou can disable the use of the `binary` package using `-f-binary`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.EnabledManual
bytestringYou 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
bytestring-builderYou can disable the use of the `bytestring-builder` package using `-f-bytestring-builder`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.EnabledAutomatic
containersYou 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
deepseqYou 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
taggedYou can disable the use of the `tagged` package using `-f-tagged`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.EnabledManual
textYou 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
transformersYou can disable the use of the `transformers` package using `-f-transformers`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.EnabledManual
unordered-containersYou 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

Readme for semigroups-0.18.2

semigroups

Hackage 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