M. Petkov

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While in the univariate case solutions of linear recurrences with constant coeecients have rational generating functions, in the multivariate case the situation is much more interesting: even though(More)
Let t n denote the number of unlabeled trees on n vertices. Let t(x) = P 1 n=1 t n x n be the corresponding generating function. Similarly, let T n , h n , and i n denote the numbers of rooted trees,(More)