The invariant basis property of rings

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

Created on 2022-05-19.
Last modified on 2025-10-31.

module ring-theory.invariant-basis-property-rings where
Imports 
open import elementary-number-theory.natural-numbers

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

open import ring-theory.dependent-products-rings
open import ring-theory.isomorphisms-rings
open import ring-theory.rings

open import univalent-combinatorics.standard-finite-types

Idea

A ring R is said to satisfy the invariant basis property if R^m ≅ R^n implies m = n for any two natural numbers m and n.

Definition

invariant-basis-property-Ring :
  {l1 : Level} → Ring l1 → UU l1
invariant-basis-property-Ring R =
  (m n : ℕ) →
  iso-Ring (Π-Ring (Fin m) (λ i → R)) (Π-Ring (Fin n) (λ i → R)) →
  m ＝ n

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