Vectors on commutative rings

Content created by Jonathan Prieto-Cubides, Fredrik Bakke and Egbert Rijke.

Created on 2023-02-20.
Last modified on 2024-03-19.

module linear-algebra.vectors-on-commutative-rings where
open import commutative-algebra.commutative-rings

open import elementary-number-theory.natural-numbers

open import foundation.identity-types
open import foundation.universe-levels

open import group-theory.commutative-monoids
open import group-theory.monoids
open import group-theory.semigroups

open import linear-algebra.constant-vectors
open import linear-algebra.vectors-on-rings


Vectors on a commutative ring R are vectors on the underlying type of R. The commutative ring structure on R induces further structure on the type of vectors on R.


Listed vectors on commutative rings

module _
  {l : Level} (R : Commutative-Ring l)

  vec-Commutative-Ring :   UU l
  vec-Commutative-Ring = vec-Ring (ring-Commutative-Ring R)

  head-vec-Commutative-Ring :
    {n : }  vec-Commutative-Ring (succ-ℕ n)  type-Commutative-Ring R
  head-vec-Commutative-Ring = head-vec-Ring (ring-Commutative-Ring R)

  tail-vec-Commutative-Ring :
    {n : }  vec-Commutative-Ring (succ-ℕ n)  vec-Commutative-Ring n
  tail-vec-Commutative-Ring = tail-vec-Ring (ring-Commutative-Ring R)

  snoc-vec-Commutative-Ring :
    {n : }  vec-Commutative-Ring n  type-Commutative-Ring R 
    vec-Commutative-Ring (succ-ℕ n)
  snoc-vec-Commutative-Ring = snoc-vec-Ring (ring-Commutative-Ring R)

Functional vectors on commutative rings

module _
  {l : Level} (R : Commutative-Ring l)

  functional-vec-Commutative-Ring :   UU l
  functional-vec-Commutative-Ring =
    functional-vec-Ring (ring-Commutative-Ring R)

  head-functional-vec-Commutative-Ring :
    (n : )  functional-vec-Commutative-Ring (succ-ℕ n) 
    type-Commutative-Ring R
  head-functional-vec-Commutative-Ring =
    head-functional-vec-Ring (ring-Commutative-Ring R)

  tail-functional-vec-Commutative-Ring :
    (n : )  functional-vec-Commutative-Ring (succ-ℕ n) 
    functional-vec-Commutative-Ring n
  tail-functional-vec-Commutative-Ring =
    tail-functional-vec-Ring (ring-Commutative-Ring R)

  cons-functional-vec-Commutative-Ring :
    (n : )  type-Commutative-Ring R 
    functional-vec-Commutative-Ring n 
    functional-vec-Commutative-Ring (succ-ℕ n)
  cons-functional-vec-Commutative-Ring =
    cons-functional-vec-Ring (ring-Commutative-Ring R)

  snoc-functional-vec-Commutative-Ring :
    (n : )  functional-vec-Commutative-Ring n 
    type-Commutative-Ring R  functional-vec-Commutative-Ring (succ-ℕ n)
  snoc-functional-vec-Commutative-Ring =
    snoc-functional-vec-Ring (ring-Commutative-Ring R)

Zero vector on a commutative ring

The zero listed vector

module _
  {l : Level} (R : Commutative-Ring l)

  zero-vec-Commutative-Ring : {n : }  vec-Commutative-Ring R n
  zero-vec-Commutative-Ring = constant-vec (zero-Commutative-Ring R)

The zero functional vector

module _
  {l : Level} (R : Commutative-Ring l)

  zero-functional-vec-Commutative-Ring :
    (n : )  functional-vec-Commutative-Ring R n
  zero-functional-vec-Commutative-Ring n i = zero-Commutative-Ring R

Pointwise addition of vectors on a commutative ring

Pointwise addition of listed vectors on a commutative ring

module _
  {l : Level} (R : Commutative-Ring l)

  add-vec-Commutative-Ring :
    {n : }  vec-Commutative-Ring R n  vec-Commutative-Ring R n 
    vec-Commutative-Ring R n
  add-vec-Commutative-Ring =
    add-vec-Ring (ring-Commutative-Ring R)

  associative-add-vec-Commutative-Ring :
    {n : } (v1 v2 v3 : vec-Commutative-Ring R n) 
    add-vec-Commutative-Ring (add-vec-Commutative-Ring v1 v2) v3 
    add-vec-Commutative-Ring v1 (add-vec-Commutative-Ring v2 v3)
  associative-add-vec-Commutative-Ring =
    associative-add-vec-Ring (ring-Commutative-Ring R)

  vec-Commutative-Ring-Semigroup :   Semigroup l
  vec-Commutative-Ring-Semigroup =
    vec-Ring-Semigroup (ring-Commutative-Ring R)

  left-unit-law-add-vec-Commutative-Ring :
    {n : } (v : vec-Commutative-Ring R n) 
    add-vec-Commutative-Ring (zero-vec-Commutative-Ring R) v  v
  left-unit-law-add-vec-Commutative-Ring =
    left-unit-law-add-vec-Ring (ring-Commutative-Ring R)

  right-unit-law-add-vec-Commutative-Ring :
    {n : } (v : vec-Commutative-Ring R n) 
    add-vec-Commutative-Ring v (zero-vec-Commutative-Ring R)  v
  right-unit-law-add-vec-Commutative-Ring =
    right-unit-law-add-vec-Ring (ring-Commutative-Ring R)

  vec-Commutative-Ring-Monoid :   Monoid l
  vec-Commutative-Ring-Monoid =
    vec-Ring-Monoid (ring-Commutative-Ring R)

  commutative-add-vec-Commutative-Ring :
    {n : } (v w : vec-Commutative-Ring R n) 
    add-vec-Commutative-Ring v w  add-vec-Commutative-Ring w v
  commutative-add-vec-Commutative-Ring =
    commutative-add-vec-Ring (ring-Commutative-Ring R)

  vec-Commutative-Ring-Commutative-Monoid :   Commutative-Monoid l
  vec-Commutative-Ring-Commutative-Monoid =
    vec-Ring-Commutative-Monoid (ring-Commutative-Ring R)

Pointwise addition of functional vectors on a commutative ring

module _
  {l : Level} (R : Commutative-Ring l)

  add-functional-vec-Commutative-Ring :
    (n : ) (v w : functional-vec-Commutative-Ring R n) 
    functional-vec-Commutative-Ring R n
  add-functional-vec-Commutative-Ring =
    add-functional-vec-Ring (ring-Commutative-Ring R)

  associative-add-functional-vec-Commutative-Ring :
    (n : ) (v1 v2 v3 : functional-vec-Commutative-Ring R n) 
    ( add-functional-vec-Commutative-Ring n
      ( add-functional-vec-Commutative-Ring n v1 v2) v3) 
    ( add-functional-vec-Commutative-Ring n v1
      ( add-functional-vec-Commutative-Ring n v2 v3))
  associative-add-functional-vec-Commutative-Ring =
    associative-add-functional-vec-Ring (ring-Commutative-Ring R)

  functional-vec-Commutative-Ring-Semigroup :   Semigroup l
  functional-vec-Commutative-Ring-Semigroup =
    functional-vec-Ring-Semigroup (ring-Commutative-Ring R)

  left-unit-law-add-functional-vec-Commutative-Ring :
    (n : ) (v : functional-vec-Commutative-Ring R n) 
    add-functional-vec-Commutative-Ring n
      ( zero-functional-vec-Commutative-Ring R n) v  v
  left-unit-law-add-functional-vec-Commutative-Ring =
    left-unit-law-add-functional-vec-Ring (ring-Commutative-Ring R)

  right-unit-law-add-functional-vec-Commutative-Ring :
    (n : ) (v : functional-vec-Commutative-Ring R n) 
    add-functional-vec-Commutative-Ring n v
      ( zero-functional-vec-Commutative-Ring R n)  v
  right-unit-law-add-functional-vec-Commutative-Ring =
    right-unit-law-add-functional-vec-Ring (ring-Commutative-Ring R)

  functional-vec-Commutative-Ring-Monoid :   Monoid l
  functional-vec-Commutative-Ring-Monoid =
    functional-vec-Ring-Monoid (ring-Commutative-Ring R)

  commutative-add-functional-vec-Commutative-Ring :
    (n : ) (v w : functional-vec-Commutative-Ring R n) 
    add-functional-vec-Commutative-Ring n v w 
    add-functional-vec-Commutative-Ring n w v
  commutative-add-functional-vec-Commutative-Ring =
    commutative-add-functional-vec-Ring (ring-Commutative-Ring R)

  functional-vec-Commutative-Ring-Commutative-Monoid :   Commutative-Monoid l
  functional-vec-Commutative-Ring-Commutative-Monoid =
    functional-vec-Ring-Commutative-Monoid (ring-Commutative-Ring R)

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