Abstract
In this paper, a bivariate generating function \(CF(x,y) = \frac{{f(x) - yf(xy)}} {{1 - y}}\) is investigated, where f(x) = Σ n⩾0 f n x n is a generating function satisfying the functional equation f(x) = 1 + Σ j=1 r Σ i=j−1 m a ij x i f(x) j . In particular, we study lattice paths in which their end points are on the line y = 1. Rooted lattice paths are defined. It is proved that the function CF(x, y) is a generating function defined on some rooted lattice paths with end point on y = 1. So, by a simple and unified method, from the view of lattice paths, we obtain two combinatorial interpretations of this bivariate function and derive two uniform partitions on these rooted lattice paths.
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