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Oct 9, 2014 at 15:11 comment added Vladimir Dotsenko @FrancescoPolizzi: sure, that's another good example. I just like the fact that this pair of questions allows for almost identical examples.
Oct 9, 2014 at 15:01 comment added Francesco Polizzi For the question with "injective" instead of "surjective", it sufficies to remember that the free group with $2$ generators contains the free group with $3$ generators as a subgroup.
Oct 9, 2014 at 14:41 history edited Vladimir Dotsenko CC BY-SA 3.0
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Oct 9, 2014 at 14:14 history answered Vladimir Dotsenko CC BY-SA 3.0