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Autor:
Albert Oloo Nyariaro
Publikováno v:
Open Journal of Mathematical Sciences, Vol 5, Iss 1, Pp 360-370 (2021)
In this paper, we prove some new formulas in the enumeration of labelled t-ary trees by path lengths. We treat trees having their edges oriented from a vertex of lower label towards a vertex of higher label. Among other results, we obtain counting fo