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Fix Ring laws; fixes #212 #228

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Oct 6, 2020
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Fix Ring laws; fixes #212 #228

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5 changes: 3 additions & 2 deletions src/Data/Ring.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -15,10 +15,11 @@ import Type.Data.RowList (RLProxy(..))
-- | The `Ring` class is for types that support addition, multiplication,
-- | and subtraction operations.
-- |
-- | Instances must satisfy the following law in addition to the `Semiring`
-- | Instances must satisfy the following laws in addition to the `Semiring`
-- | laws:
-- |
-- | - Additive inverse: `a - a = (zero - a) + a = zero`
-- | - Additive inverse: `a - a = zero`
-- | - Compatibility of `sub` and `negate`: `a - b = a + (zero - b)`
class Semiring a <= Ring a where
sub :: a -> a -> a

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