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Jul 16, 2020 at 22:02 vote accept Matthew Kahle
Jul 16, 2020 at 22:00 comment added Gjergji Zaimi @SamHopkins It was originally investigated by (among others) Cayley, then Polya (rooted case), then finally Otter in the form I mention above.
Jul 16, 2020 at 21:57 comment added Sam Hopkins Huh, I've routinely heard the result from Q1 attributed to Polya.
Jul 16, 2020 at 21:52 history answered Gjergji Zaimi CC BY-SA 4.0