The higher group of integers

Content created by Egbert Rijke and Fredrik Bakke.

Created on 2023-04-10.
Last modified on 2023-09-15.

module higher-group-theory.integers-higher-group where
Imports 
open import foundation.dependent-pair-types
open import foundation.universe-levels

open import higher-group-theory.higher-groups

open import structured-types.pointed-types

open import synthetic-homotopy-theory.circle

Idea

The higher group of integers is defined to be the circle. The loop space of the circle is ℤ.

Definition

module _
  where

  classifying-type-ℤ-∞-Group : UU lzero
  classifying-type-ℤ-∞-Group = 𝕊¹

  shape-ℤ-∞-Group : 𝕊¹
  shape-ℤ-∞-Group = base-𝕊¹

  classifying-pointed-type-ℤ-∞-Group : Pointed-Type lzero
  pr1 classifying-pointed-type-ℤ-∞-Group = classifying-type-ℤ-∞-Group
  pr2 classifying-pointed-type-ℤ-∞-Group = shape-ℤ-∞-Group

  ℤ-∞-Group : ∞-Group lzero
  pr1 ℤ-∞-Group = classifying-pointed-type-ℤ-∞-Group
  pr2 ℤ-∞-Group = is-0-connected-𝕊¹

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