| License | MIT |
|---|---|
| Maintainer | mail@doisinkidney.com |
| Stability | experimental |
| Safe Haskell | None |
| Language | Haskell2010 |
Data.Semiring
Description
Documentation
class Semiring a where Source #
A Semiring is like the
the combination of two Monoids. The first
is called <+>; it has the identity element zero, and it is
commutative. The second is called <.>; it has identity element one,
and it must distribute over <+>.
Laws
Normal Monoid laws
(a<+>b)<+>c = a<+>(b<+>c)zero<+>a = a<+>zero= a (a<.>b)<.>c = a<.>(b<.>c)one<.>a = a<.>one= a
Commutativity of <+>
a<+>b = b<+>a
Distribution of <.> over <+>
a<.>(b<+>c) = (a<.>b)<+>(a<.>c) (a<+>b)<.>c = (a<.>c)<+>(b<.>c)
Annihilation
zero<.>a = a<.>zero=zero
Methods
The identity of <+>.
The identity of <.>.
(<.>) :: a -> a -> a infixl 7 Source #
An associative binary operation, which distributes over <+>.
(<+>) :: a -> a -> a infixl 6 Source #
An associative, commutative binary operation.
The identity of <+>.
The identity of <.>.
(<+>) :: Num a => a -> a -> a infixl 6 Source #
An associative, commutative binary operation.
(<.>) :: Num a => a -> a -> a infixl 7 Source #
An associative binary operation, which distributes over <+>.
Instances
Instances
| Monad Add Source # | |
| Functor Add Source # | |
| Applicative Add Source # | |
| Foldable Add Source # | |
| Generic1 Add Source # | |
| Bounded a => Bounded (Add a) Source # | |
| Enum a => Enum (Add a) Source # | |
| Eq a => Eq (Add a) Source # | |
| Fractional a => Fractional (Add a) Source # | |
| Num a => Num (Add a) Source # | |
| Ord a => Ord (Add a) Source # | |
| Read a => Read (Add a) Source # | |
| Real a => Real (Add a) Source # | |
| RealFrac a => RealFrac (Add a) Source # | |
| Show a => Show (Add a) Source # | |
| Generic (Add a) Source # | |
| Semiring a => Semigroup (Add a) Source # | |
| Semiring a => Monoid (Add a) Source # | |
| Storable a => Storable (Add a) Source # | |
| Semiring a => Semiring (Add a) Source # | |
| type Rep1 Add Source # | |
| type Rep (Add a) Source # | |
Instances
| Monad Mul Source # | |
| Functor Mul Source # | |
| Applicative Mul Source # | |
| Foldable Mul Source # | |
| Generic1 Mul Source # | |
| Bounded a => Bounded (Mul a) Source # | |
| Enum a => Enum (Mul a) Source # | |
| Eq a => Eq (Mul a) Source # | |
| Fractional a => Fractional (Mul a) Source # | |
| Num a => Num (Mul a) Source # | |
| Ord a => Ord (Mul a) Source # | |
| Read a => Read (Mul a) Source # | |
| Real a => Real (Mul a) Source # | |
| RealFrac a => RealFrac (Mul a) Source # | |
| Show a => Show (Mul a) Source # | |
| Generic (Mul a) Source # | |
| Semiring a => Semigroup (Mul a) Source # | |
| Semiring a => Monoid (Mul a) Source # | |
| Storable a => Storable (Mul a) Source # | |
| Semiring a => Semiring (Mul a) Source # | |
| type Rep1 Mul Source # | |
| type Rep (Mul a) Source # | |
The "Arctic" or max-plus semiring. It is a semiring where:
<+>=maxzero= -∞ -- represented byNothing<.>=<+>one=zero
Note that we can't use Max from Semigroup
because annihilation needs to hold:
-∞<+>x = x<+>-∞ = -∞
Taking -∞ to be minBound would break the above law. Using Nothing
to represent it follows the law.
Instances
| Monad Max Source # | |
| Functor Max Source # | |
| Applicative Max Source # | |
| Foldable Max Source # | |
| Generic1 Max Source # | |
| Bounded a => Bounded (Max a) Source # | |
| Eq a => Eq (Max a) Source # | |
| Ord a => Ord (Max a) Source # | |
| Read a => Read (Max a) Source # | |
| Show a => Show (Max a) Source # | |
| Generic (Max a) Source # | |
| Ord a => Semigroup (Max a) Source # | |
| Ord a => Monoid (Max a) Source # |
|
| (Semiring a, Ord a) => Semiring (Max a) Source # | |
| type Rep1 Max Source # | |
| type Rep (Max a) Source # | |
The "Tropical" or min-plus semiring. It is a semiring where:
<+>=minzero= ∞ -- represented byNothing<.>=<+>one=zero
Note that we can't use Min from Semigroup
because annihilation needs to hold:
∞<+>x = x<+>∞ = ∞
Taking ∞ to be maxBound would break the above law. Using Nothing
to represent it follows the law.
Instances
| Monad Min Source # | |
| Functor Min Source # | |
| Applicative Min Source # | |
| Foldable Min Source # | |
| Generic1 Min Source # | |
| Bounded a => Bounded (Min a) Source # | |
| Eq a => Eq (Min a) Source # | |
| Ord a => Ord (Min a) Source # | |
| Read a => Read (Min a) Source # | |
| Show a => Show (Min a) Source # | |
| Generic (Min a) Source # | |
| Ord a => Semigroup (Min a) Source # | |
| Ord a => Monoid (Min a) Source # |
|
| (Semiring a, Ord a) => Semiring (Min a) Source # | |
| type Rep1 Min Source # | |
| type Rep (Min a) Source # | |