With four elements, the Klein four-group is the smallest non-cyclic group, and the cyclic group of order 4 and the Klein four-group are, up to isomorphism, the only groups of order 4.
group is the smallest non-cyclic group. This is with four elements. This is up to isomorphism.-group is the cyclic group of order 4 and the Klein four. This is with four elements. This is up to isomorphism.-group are the only groups of order 4. This is with four elements. This is up to isomorphism. The Klein four is four elements.