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Prove or disprove: If a group G is such that every proper subgroup is cyclic, then G is cyclic.
Solution
All of its proper subgroups are cyclic, but V4 is not itself cyclic. Another example would be the
dihedral group D3. Every proper subgroup has order 1, 2, or 3, and is thus cyclic. However, D3
is not cyclic. (It is not even abelian.)
Of course, the counterexample can be shown: the Klein group Z/2ZZ/2Z.

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