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Haskell 98 semigroupoids: Category sans id; documentation

A Semigroupoid is a Category without the requirement of identity arrows for every object in the category.

When working with comonads you often have the <*> portion of an Applicative, but not the pure. This was captured in Uustalu and Vene's "Essence of Dataflow Programming" in the form of the ComonadZip class in the days before Applicative. Apply provides a weaker invariant, but for the comonads used for data flow programming (found in the streams package), this invariant is preserved. Applicative function composition forms a semigroupoid.

This package provides the documentation for a library for the Haskell programming language. See for more information on Haskell.

Package version:


haskell-semigroupoids ( unstable; urgency=low

  * New upstream release

 -- Joachim Breitner <>  Thu, 17 May 2012 12:52:20 +0200

haskell-semigroupoids ( unstable; urgency=low

  * New upstream release

 -- Joachim Breitner <>  Sat, 04 Feb 2012 19:43:52 +0100

haskell-semigroupoids (1.2.6-1) unstable; urgency=low

  * Initial release.

 -- I


Name: semigroupoids
Maintainer: Edward A. Kmett <>

Copyright: (C) 2007-2011 Edward Kmett
License: BSD
 All rights reserved.
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that 

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