Answer to Question #139772 in Abstract Algebra for J

Question #139772
Prove that if (G,*) is a group, and if the only subgroups of G are G and {e}, then G is cyclic.
1
Expert's answer
2020-10-25T19:10:38-0400

Let a be a nonidentity element of G. We consider the group H generated by single element a.

H=<a>. Clearly all elements of H must belong to G. Therefore H becomes a subgroup of G.

But as a"\\neq e", H"\\neq \\{e\\}" . Therefore H=<a>=G. (as the only subgroups of G are "\\{e\\}, G)"

Hence G becomes cyclic.


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