Finitely generated and free implies Hopfian
This article gives the statement and possibly, proof, of an implication relation between two group properties. That is, it states that every group satisfying the first group property (i.e., finitely generated free group) must also satisfy the second group property (i.e., Hopfian group)
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Any finitely generated free group is Hopfian: it is not isomorphic to any proper quotient of itself.
The proof follows directly by combining facts (1) and (2).