Furstenberg groups

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

Created on 2022-03-12.
Last modified on 2023-03-15.

module group-theory.furstenberg-groups where
Imports 
open import foundation.cartesian-product-types
open import foundation.dependent-pair-types
open import foundation.identity-types
open import foundation.propositional-truncations
open import foundation.sets
open import foundation.universe-levels

Definition

Furstenberg-Group : (l : Level) → UU (lsuc l)
Furstenberg-Group l =
  Σ ( Set l)
    ( λ X →
      ( type-trunc-Prop (type-Set X)) ×
      ( Σ ( type-Set X → type-Set X → type-Set X)
          ( λ μ →
            ( (x y z : type-Set X) → Id (μ (μ x z) (μ y z)) (μ x y)) ×
            ( Σ ( type-Set X → type-Set X → type-Set X)
                ( λ δ → (x y : type-Set X) → Id (μ x (δ x y)) y)))))

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