Module

Data.CommutativeRing

Package
purescript-prelude
Repository
purescript/purescript-prelude

#CommutativeRing Source

class (Ring a) <= CommutativeRing a 

The CommutativeRing class is for rings where multiplication is commutative.

Instances must satisfy the following law in addition to the Ring laws:

  • Commutative multiplication: a * b = b * a

Instances

#CommutativeRingRecord Source

class (RingRecord rowlist row subrow) <= CommutativeRingRecord rowlist row subrow | rowlist -> subrow

A class for records where all fields have CommutativeRing instances, used to implement the CommutativeRing instance for records.

Instances

Re-exports from Data.Ring

#Ring Source

class (Semiring a) <= Ring a 

The Ring class is for types that support addition, multiplication, and subtraction operations.

Instances must satisfy the following laws in addition to the Semiring laws:

  • Additive inverse: a - a = zero
  • Compatibility of sub and negate: a - b = a + (zero - b)

Instances

#RingRecord Source

class (SemiringRecord rowlist row subrow) <= RingRecord rowlist row subrow | rowlist -> subrow

Instances

Re-exports from Data.Semiring

#Semiring Source

class Semiring a  where

The Semiring class is for types that support an addition and multiplication operation.

Instances must satisfy the following laws:

  • Commutative monoid under addition:
    • Associativity: (a + b) + c = a + (b + c)
    • Identity: zero + a = a + zero = a
    • Commutative: a + b = b + a
  • Monoid under multiplication:
    • Associativity: (a * b) * c = a * (b * c)
    • Identity: one * a = a * one = a
  • Multiplication distributes over addition:
    • Left distributivity: a * (b + c) = (a * b) + (a * c)
    • Right distributivity: (a + b) * c = (a * c) + (b * c)
  • Annihilation: zero * a = a * zero = zero

Note: The Number and Int types are not fully law abiding members of this class hierarchy due to the potential for arithmetic overflows, and in the case of Number, the presence of NaN and Infinity values. The behaviour is unspecified in these cases.

Members

Instances

#(+) Source

Operator alias for Data.Semiring.add (left-associative / precedence 6)

#(*) Source

Operator alias for Data.Semiring.mul (left-associative / precedence 7)