# Changes

# the [[Klein four group]] consists of the set of formal symbols $\{1, i, j, k \}$ with the relations $i^{2} =j^{2}=k^{2}=1, \; ij=k, \; jk=i, \; ki=j.$ All elements of the Klein four group (except the identity 1) have [[order]] 2. The Klein four group is [[isomorphism|isomorphic]] to $\mathbb{Z}_{2} \times \mathbb{Z}_{2}$ under mod addition.