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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeOct 2nd 2018

some minimum, for completeness of the list at D4

• CommentRowNumber2.
• CommentAuthorUrs
• CommentTimeFeb 18th 2019
• (edited Feb 18th 2019)

added statement of some trivialities, just for completeness:

Besides the cyclic group $\mathbb{Z}/4$ of order 4, the Klein group $\mathbb{Z}/2 \times \mathbb{Z}/2$ is the only other group of order 4, up to isomorphism.

In particular the Klein group is not itself a cyclic group, and it is in fact the smallest non-trivial group which is not a cyclic group.

• CommentRowNumber3.
• CommentAuthorUrs
• CommentTimeOct 24th 2020
• (edited Oct 24th 2020)