Golod's theorem on locally finite groups
This article gives the statement and possibly, proof, of a non-implication relation between two group properties. That is, it states that every group satisfying the first group property (i.e., 2-locally finite group) need not satisfy the second group property (i.e., locally finite group)
View a complete list of group property non-implications | View a complete list of group property implications
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Statement
Let be a positive integer. Then, there exists an infinite group with a generating set of size such that every subgroup generated by elements is a finite group.
In particular, this shows that there exist groups that are -locally finite (every subgroup generated by elements is finite) but not -locally finite (i.e., there exist subgroups generated by elements that are infinite), and therefore, in particular, not locally finite.
References
MathOverflow question: Example of 2-locally finite group that is not locally finite
- First answer references a paper that describes the example