monus

a 'Monus' is a commutative monoid that allows a notion of substraction.

https://github.com/andrewthad/monus#readme

Latest on Hackage:

0.2.0.0

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BSD-3-Clause licensed by Andrew Martin

Maintained by [email protected]

A Monus is a commutative monoid that allows a notion of substraction, with the following laws:

x <> (y - x) = y <> (x - y)

(x - y) - z = x - (y <> z)

x - x = mempty

mempty - x = mempty