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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Versions0.1.0, 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
Change logNone available
Dependenciesbase (>=2 && <5), bytestring (>=0.9 && <1), containers (>=0.3 && <0.6), ghc-prim, hashable (>=1.1 && <1.3), nats (>=0.1 && <1), text (>=0.10 && <2), unordered-containers (==0.2.*) [details]
LicenseBSD3
CopyrightCopyright (C) 2011-2014 Edward A. Kmett
AuthorEdward A. Kmett
MaintainerEdward A. Kmett <ekmett@gmail.com>
Stabilityprovisional
CategoryAlgebra, Data, Data Structures, Math
Home pagehttp://github.com/ekmett/semigroups/
Bug trackerhttp://github.com/ekmett/semigroups/issues
Source repositoryhead: git clone git://github.com/ekmett/semigroups.git
UploadedFri Jul 25 12:20:10 UTC 2014 by EdwardKmett
DistributionsDebian:0.16.2.2, Fedora:0.16.0.1, FreeBSD:0.15.2, LTSHaskell:0.16.2.2, NixOS:0.16.2.2, Stackage:0.16.2.2
Downloads228039 total (1249 in last 30 days)
Votes
3 []
StatusDocs available [build log]
Successful builds reported [all 1 reports]

Modules

[Index]

Flags

NameDescriptionDefault
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.Enabled
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.Enabled
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.Enabled
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.Enabled
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.Enabled

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

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Maintainers' corner

For package maintainers and hackage trustees

Readme for semigroups-0.15.2

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