Timeline for Hopfian and Co-Hopfian groups (examples)
Current License: CC BY-SA 2.5
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| Sep 12, 2021 at 9:54 | history | made wiki | Post Made Community Wiki by Stefan Kohl♦ | ||
| Mar 28, 2011 at 17:02 | comment | added | Colin Reid | In this paper (Theorem E) I show that all just infinite profinite groups that are not virtually abelian are open co-Hopfian: arxiv.org/abs/0906.1771 On the other hand, isomorphisms between a group and its closed subgroups are much more difficult to control, for instance self-reproducing branch groups are clearly not co-Hopfian. | |
| Mar 28, 2011 at 10:03 | history | edited | Yiftach Barnea | CC BY-SA 2.5 |
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| Mar 28, 2011 at 7:15 | history | edited | Yiftach Barnea | CC BY-SA 2.5 |
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| Mar 27, 2011 at 20:02 | history | answered | Yiftach Barnea | CC BY-SA 2.5 |