The eq package

[Tags:bsd3, library]

Leibnizian equality

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Versions 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 0.3.3,, 0.3.4,,,, 0.3.5, 0.3.6, 0.3.7,, 3.0, 3.1, 3.1.1, 4.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4
Change log CHANGELOG.markdown
Dependencies base (==4.*), groupoids (>=3), semigroupoids (>=3) [details]
License BSD3
Copyright Copyright (C) 2011-2013 Edward A. Kmett
Author Edward A. Kmett
Maintainer Edward A. Kmett <>
Category Type System
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Source repository head: git clone git://
Uploaded Mon Apr 8 14:18:04 UTC 2013 by EdwardKmett
Distributions LTSHaskell:4.0.4, NixOS:4.0.4, Stackage:4.0.4, Tumbleweed:4.0.4
Downloads 5408 total (70 in the last 30 days)
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Status Docs uploaded by user
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Maintainer's Corner

For package maintainers and hackage trustees

Readme for eq

Readme for eq-3.1


Build Status

This package provides a data type that witnesses equality between two types using Leibnizian equality.

It includes a refinement to the notion of Leibnizian equality by Oleg Kiselyov that permits it to refine equality using the injectively of type constructors via type families.

Contact Information

Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on

-Edward Kmett