Comments to Generalized Chebyshev polynomial P23


The interest to the trees M23a and M23b is due to the fact that they are the only (up to symmetry) trees edge rotation group of which is Matieu group M23. This was proved by

N.M.Adrianov, Yu.Yu.Kochetkov, A.D.Suvorov and G.B.Shabat
Matieu groups and plane trees (in Russian)
Fundamental'naya i prikladnaya matematika, 1(2):377-384, 1995;
correction: ibid, 2(1):317, 1996

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