On the $f$-Matrices of Pascal-like Triangles Defined by Riordan Arrays

Abstract

We define and characterize the $f$-matrices associated to Pascal-like matrices that are defined by ordinary and exponential Riordan arrays. These generalize the face matrices of simplices and hypercubes. Their generating functions can be expressed simply in terms of continued fractions, which are shown to be transformations of the generating functions of the corresponding $\gamma$- and $h$-matrices.