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Timeline for $G_n$ 's mutually non-isomorphic

Current License: CC BY-SA 3.0

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Sep 5, 2017 at 5:17 vote accept Mojtaba
Sep 4, 2017 at 12:08 comment added YCor Serre's book on trees (Arbres Amalgames SL2 in French, Trees in English). Note that there is no "HNN presentation"; I just phrased it to mean a presentation from which it's visibly an HNN extension.
Sep 4, 2017 at 11:53 comment added Mojtaba Thank you for your answer a lot. Could you introduce a reference for the concepts like ''HNN presentation'', ''HNN extension'', ''loxodromic element'', ''Bass-Serre tree'' and ''A-invariant'' for me to understand more your answer? Because I'm not familiar much with them.
Sep 2, 2017 at 11:44 history edited YCor CC BY-SA 3.0
fixed typo, added remark
Sep 2, 2017 at 10:28 history answered YCor CC BY-SA 3.0